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A print head device, which includes a plurality of image carrying bodies, a plurality of developing units, a plurality of charging units, and at least one intermediate transfer unit, is constructed as a unit assembly, and the unit assembly is inserted into and removed from image forming apparatus ma

A print head device, which includes a plurality of image carrying bodies, a plurality of developing units, a plurality of charging units, and at least one intermediate transfer unit, is constructed as a unit assembly, and the unit assembly is inserted into and removed from image forming apparatus main body. The image forming apparatus contains a mechanism that the image carrying bodies are minutely movably supported by a frame of the unit assembly with a gap being located therebetween, and are positioned and fixed to a housing of the image forming apparatus main body.

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A print head device, which includes a plurality of image carrying bodies, a plurality of developing units, a plurality of charging units, and at least one intermediate transfer unit, is constructed as a unit assembly, and the unit assembly is inserted into and removed from image forming apparatus ma

A print head device, which includes a plurality of image carrying bodies, a plurality of developing units, a plurality of charging units, and at least one intermediate transfer unit, is constructed as a unit assembly, and the unit assembly is inserted into and removed from image forming apparatus main body. The image forming apparatus contains a mechanism that the image carrying bodies are minutely movably supported by a frame of the unit assembly with a gap being located therebetween, and are positioned and fixed to a housing of the image forming apparatus main body. s applying portion with the center of the core is 3 degrees or less.4. A method of producing a polarization maintaining optical fiber perform including a core element, a cladding element disposed around the core element, and two stress applying elements disposed in the cladding element to be approximately symmetrical with respect to the core element, comprising: a step of forming one insertion hold in the cladding element so as to pierce through the cladding element in parallel to the core element; a step of rotating the optical fiber perform further including the insertion hole 180 degrees around the core element; a step of forming the other insertion hole in the cladding element so as to pierce through the cladding element in parallel to the core element; and a step of inserting the stress applying elements into the insertion holes. 5. A method of producing a polarization maintaining optical fiber comprising: a step of melting and drawing the polarization maintaining optical fiber preform produced by the method according to claim 4.6. A method of producing a polarization maintaining optical fiber preform including a core element, a cladding element disposed around the core element, and two stress applying elements disposed in the cladding element to be approximately symmetrical with respect to the core element, comprising: a step of forming one insertion hole in the cladding element so as to pierce through the cladding element in parallel to the core element; a step of rotating the optical fiber preform further including the insertion hole 180 degrees around the core element; a step of forming the other insertion hole in the cladding element so as to pierce through the cladding element in parallel to the core element; and a step of inserting the stress applying elements into the insertion holes; whereby an angle formed by a line connecting a center of one of stress applying portion with a center of the core and a line connecting a center of the other stress applying portion with the center of the core is 3 degrees or less. 7. A method of producing a polarization maintaining optical fiber comprising: a step of producing a polarization maintaining optical fiber preform by the method of claim 6; and a step of melting and drawing the polarization maintaining optical fiber preform to produce the polarization maintaining optical fiber. 8. A polarization maintaining optical fiber produced by the method of producing a polarization maintaining optical fiber according to claim 7.9. A polarization maintaining optical fiber preform produce by the method of producing a polarization maintaining optical fiber preform according to claim 6. ication method according to claim 1 wherein the transmission timing of a transmission permission signal transmitted by said control node to each controlled node at least includes time delay corresponding to the time which elapses since start of light emission by the transmission-permitted controlled node with said desired transient characteristics until the controlled node reaches the actually transmission enabled state.3. The optical communication method according to claim 1 wherein light emission is started or interrupted with said desired transient characteristics even in the control node and wherein said desired transient characteristics are such that light emission is started directly before transmission by said control node and the controlled node and such that light emission is interrupted directly following transmission by said control node and the controlled node.4. The optical communication method according to claim 1 wherein said frequency components generated on starting or interrupting the emission of the light rays by said controlled node are generated in a frequency range not less than 6 MHz.5. The optical communication method according to claim 1 wherein said light rays are infrared rays.6. An optical communication apparatus used in a communication network doing communication with light rays amplitude-modulated by a carrier modulation signal of a first pre-set frequency range, comprising: inputting means for inputting a transmission permission signal transmitted by a node connected to said communication network; and light emission control means for starting or interrupting emission of said light rays from a light emission circuit at desired transient characteristics by having reference to the transmitted transmission permission signal, whereby the transmission permission signal (i) informs a controlled node as to when transmission of the light rays is to start or stop and (ii) enables the light emission circuit of a respective controlled node to be activated or deactivated, and wherein said desired transient characteristics are such that frequency components generated on starting or interrupting the emission of the light rays by said controlled node are not generated in a frequency range of approximately 33 kHz to 6 MHz. 7. The optical communication apparatus according to claim 6 wherein the transmission timing of the transmission permission signal at least includes time delay corresponding to the time which elapses since start of light emission with said desired transient characteristics until the controlled node reaches the actually transmission enabling state.8. The optical communication apparatus according to claim 6 wherein said desired transient characteristics are such characteristics in which emission of said light rays is started directly before transmission or interrupted directly after transmission.9. The optical communication apparatus according to claim 6 wherein said frequency components generated on starting or interrupting the emission of the light rays by said controlled node are generated in a frequency range not less than 6 MHz.10. The optical communication apparatus according to claim 6 wherein said light rays are infrared rays.11. An optical communication apparatus used in a communication network in which communication is had between a control node and a number of controlled nodes using light rays amplitude-modulated by a carrier modulation signals of a first pre-set frequency range, wherein: said control node at least includes transmission permission signal transmitting means for transmitting a transmission permission signal to each controlled node; and wherein each controlled node has at least light emission control means for starting or interrupting emission of the light rays from a light emission circuit with desired transient characteristics by having reference to said transmission permission signal, whereby the transmission permission signal (i) informs the respectiv