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An image forming method includes the steps of: forming a plurality of electrostatic latent images of a non-solid control patch by converting a reference input density; detecting a patch potential of each of the plurality of electrostatic latent images; calculating a density value of image data corre

An image forming method includes the steps of: forming a plurality of electrostatic latent images of a non-solid control patch by converting a reference input density; detecting a patch potential of each of the plurality of electrostatic latent images; calculating a density value of image data corresponding to a desired patch potential from the detected plurality of patch potentials; detecting a density of each of the plurality of non-solid control patches which has been formed by an imagewise exposure according to the image data of the reference input density obtained by the calculating step; forming an image by controlling an image forming condition in accordance with a detected density signal.

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1. An image forming method comprising the steps of:(a) forming a plurality of electrostatic latent images of a non-solid control patch having a non-solid pattern by converting image data having reference input densities different from each other;(b) detecting a patch potential of each of the plurali

1. An image forming method comprising the steps of:(a) forming a plurality of electrostatic latent images of a non-solid control patch having a non-solid pattern by converting image data having reference input densities different from each other;(b) detecting a patch potential of each of the plurality of electrostatic latent images;(c) calculating a single density value corresponding to a desired patch potential from the detected plurality of patch potentials;(d) detecting a density of each of the plurality of non-solid control patches which has been formed by an imagewise exposure according to the single density value of the reference input density obtained by the calculating step; and(e) forming an image by controlling an image forming condition in accordance with a detected density signal. 2. The image forming method of claim 1, wherein the reference input density to be used to form the non-solid pattern is changed according to an environmental parameter. 3. The image forming method of claim 1, wherein the density value of the image data for forming the non-solid pattern is changed according to an amount of image formation. 4. The image forming method of claim 1, wherein the density value of the image data for forming the non-solid pattern is changed according to a period of stirring time of the developing agent. 5. The image forming method of claim 1, wherein the calculating step is conducted each time a predetermined number of images is formed. 6. The image forming method of claim 1, wherein the calculating step is conducted for each predetermined period of a developing agent stirring time. 7. The image forming method of claim 1, further comprising the steps of:imagewise exposing a solid patch onto the image forming body which has been electrically charged to a potential by a charging device; andadjusting a potential between the latent image potential of the solid patch and a developing bias. 8. The image forming method of claim 7, wherein the non-solid patch is formed by a dither pattern. 9. The image forming method of claim 7, wherein the non-solid patch is formed by an error diffusion pattern. 10. The image forming method of claim 7, wherein the non-solid patch is formed by a pulse width modulation pattern. 11. The image forming method of claim 1, further comprising the steps of:detecting a temperature on the image forming body by a temperature detector; andstoring the temperature into a memory,wherein when a temperature of the image forming body during a formation of the non-solid control patch having a density is changed with respect to the temperature stored in the memory, the density of the non-solid control patch is changed according to an amount of change in the temperature of the image forming body. 12. The image forming method of claim 11, wherein the non-solid control patch is formed by a dither pattern. 13. The image forming method of claim 11, wherein the non-solid control patch is formed by an error diffusion pattern. 14. The image forming method of claim 11, wherein the non-solid control patch is formed by a laser pulse width modulation pattern. 15. The image forming method of claim 11, wherein the density of the control patch that is changed according to the change in temperature is further changed according to a change in an environmental condition. 16. The image forming method of claim 1, wherein a threshold value to be used for a calculation of a relation between a latent image potential of the non-solid control patch and the reference input density is changed according to a sensitivity of the image forming body that has been stored into a memory beforehand. 17. The image forming method of claim 16, wherein the control patch is formed by a dither pattern. 18. The image forming method of claim 16, wherein the control patch is formed by an error diffusion pattern. 19. The image forming method of claim 16, wherein the control patch is formed by a laser pulse width modulation pattern. 20. The image formin g method of claim 16, wherein a threshold value to obtain the density of the non-solid control patch is changed according to a change in an environmental condition. 21. The image forming method of claim 16, wherein a threshold value to obtain the density of the non-solid control patch is changed according to the number of images to be printed. 22. The image forming method of claim 16, wherein a threshold value to obtain the density of the non-solid control patch is changed according to a stirring time of the developing agent. 23. The image forming method of claim 1, wherein a threshold data to be used a calculation of a relation between a latent image potential of the non-solid control patch and the reference input density is changed according to a response characteristics of the writing light that have been stored into a memory beforehand. 24. The image forming method of claim 23, wherein the control patch is formed by a dither pattern. 25. The image forming method of claim 23, wherein the control patch is formed by an error diffusion pattern. 26. The image forming method of claim 23, wherein the control patch is formed by a laser pulse width modulation pattern. 27. The image forming method of claim 23, wherein a threshold value to obtain the density of the non-solid control patch is changed according to a change in an environmental condition. 28. The image forming method of claim 23, wherein a threshold value to obtain the density of the non-solid control patch is changed according to the number of images to be printed. 29. The image forming method of claim 23, wherein a threshold value to obtain the density of the non-solid control patch is changed according to a stirring time of the developing agent. 30. The image forming method of claim 23, wherein polymerized toner is used for the development. 31. An image forming method comprising:(a) forming a control patch by imagewise exposing on the basis of image data of a reference input density;(b) detecting a density of the control patch; and(c) forming an image by controlling an image forming condition in accordance with the detected signal, wherein the control patch is formed by a dither pattern,wherein the reference input density for forming the dither pattern is changed according to an environmental parameter. 32. The image forming method of claim 31, wherein the reference input density for forming the dither pattern is changed according to an amount of image formation. 33. The image forming method of claim 31, wherein the reference input density for forming the dither pattern is changed according to a stirring period of time of the developing agent. 34. The image forming method of claim 31, wherein a developing agent carrying velocity of a developing agent carrying body is made variable, and a reference value of the developing agent carrying velocity has been set, when the developing agent carrying velocity is less than the reference value, an image density adjustment is accomplished by changing the developing agent carrying velocity, and when the developing agent carrying velocity reaches the reference value, the image density adjustment is accomplished by replenishing toner to the developing device. 35. The image forming method of claim 31, wherein polymerized toner is used for development. 36. An image forming method comprising the steps of:(a) detecting an image density of a control patch which has been formed on an image forming body; and(b) conducting a first image density control before or after an image forming process and a second image density control during the image forming process in accordance with the detected image density, wherein a dither pattern is used as the control patch. 37. The image forming method of claim 36, wherein the step of conducting the first image density control includes conducting when power is supplied to an image forming apparatus. 38. The image forming method of claim 36, wherein the step of conducting the first image density control i ncludes conducting at a fixed time interval under a stand-by status. 39. The image forming method of claim 36, wherein the step of conducting the first image density control includes conducting at each predetermined time. 40. The image forming method of claim 36, wherein the detecting steps of the control patch under the first image density control, and under the second image density control include conducting by a same image density detector. 41. The image forming method of claim 36, wherein during the second image density control, toner is replenished each time a predetermined number of images are formed. 42. The image forming method of claim 36, wherein polymerized toner is used for development. 43. An image forming apparatus comprising:(a) an image forming body;(b) a latent image forming device for forming an electrostatic latent image on the image forming body in accordance with image data;(c) a developing device having a developing agent carrying body for forming a toner image by developing the electrostatic latent image formed on the image forming body;(d) a toner replenisher for replenishing toner to the developing device;(e) an image density detector for detecting an image density of the toner image formed on the image forming body; and(f) a controller for forming a control patch on the image forming body by controlling the latent image forming device and controlling an image forming condition in accordance with an output of the image density detector which has detected the image density of the control patch,wherein the control patch is formed by a patch having a non-solid pattern, andwherein a density value of the image data for forming the non-solid pattern is changed according to an environmental parameter. 44. The image forming apparatus of claim 43, wherein when a developing agent carrying velocity of the developing agent carrying body is less than a reference value, the controller executes a first image density control to adjust the carrying velocity, and when the carrying velocity reaches the reference value, the controller executes a second image density control to replenish toner by the toner replenisher without adjusting the carrying velocity. 45. The image forming apparatus of claim 43, wherein a density value of the image data for forming the non-solid pattern is changed according to an amount of image formation. 46. The image forming apparatus of claim 43, wherein a density value of the image data for forming the non-solid pattern is changed according to a stirring period of time of the developing agent. 47. The image forming apparatus of claim 43, wherein the controller controls to form the control patch having the dither pattern when a first image density control executed before or after an image forming process, and a second image density control executed during the image forming process are conducted. 48. The image forming apparatus of claim 47, wherein when power is supplied to the image forming apparatus, the controller executes the first image density control. 49. The image forming apparatus of claim 47, wherein the controller executes the first image density control at a fixed time interval under a stand-by status. 50. The image forming apparatus of claim 47, wherein the controller executes the first image density control at each predetermined time. 51. The image forming apparatus of claim 47, wherein during the second image density control, the controller replenishes toner each time a predetermined number of images are formed. 52. The image forming apparatus of claim 43, further comprising:an electrical charging device for charging the image forming body;an imagewise exposure device for imagewise exposing based on the image data and enabling an adjustment of an amount of light necessary to form the electrostatic latent image on the image forming body;a potential measuring device for measuring a potential on the image forming body;a potential sensor for detecting a potential of each of a plurality of non-solid patches which have been formed on the image forming body by modifying image data; anda calculator for calculating detected potentials to obtain a single desired patch potential,wherein the developing device forms the toner image by applying a developing bias and reversal-developing the electrostatic latent image on the image forming body,wherein the controller forms the toner image by detecting the obtained density of the non-solid patches, and controls image forming conditions on the basis of a detected signal. 53. The image forming apparatus of claim 52, wherein the controller forms the image immediately after changing intensity of the imagewise exposure device. 54. The image forming apparatus of claim 52, wherein polymerized toner is used in the developing device. 55. The image forming apparatus of claim 52, further comprising:a memory for storing a density of the control patch;a temperature detector for detecting a temperature of the image forming body during a calculation to obtain the density corresponding to a predetermined latent image potential; anda temperature memory for storing the temperature that has been detected by the temperature detector,wherein the controller controls the image forming a condition by first judging whether the temperature of the image forming body during the formation of the control patch in a copy sequence changes with respect to the temperature of the image forming body during the calculation on the density of the control patch, next changing the density of the control patch according to a difference between the two temperatures, then developing the latent image that has been exposed to light so as to achieve an optimal control patch density, and finally receiving the density signal corresponding to the toner density of the control patch detected by the density detector. 56. The image forming apparatus of claim 55, wherein the control patch is formed by either one of a dither pattern, an error diffusion pattern, and a laser pulse width modulation pattern. 57. The image forming apparatus of claim 55, further comprising a sensitivity memory for storing a sensitivity of the image forming body beforehand,wherein a threshold value to be used for the calculation performed by a calculator to obtain the density of the control patch is changed according to the sensitivity of the image forming body that has been stored into the sensitivity memory. 58. The image forming apparatus of claim 55, further comprising a storage device for storing beforehand a response characteristics of a writing light of a writer constituting the latent image forming device,wherein a threshold value to be used for the calculation performed by a calculator to obtain the density of the control patch is changed according to the response characteristics of the writing light that have been stored into the storage device. 59. The image forming apparatus of claim 55, wherein polymerized toner is used in the developing device.