JPH01243043A - Image-forming lens positioning mechanism in copying device used as image-forming type or contact type - Google Patents

Abstract

PURPOSE:To position an image-forming lens efficiently by placing a transparent reflecting plate between a film plane and a light source part, optically detecting the slide film plane by means of photoelectric transfer elements to focus it at the time of forming and exposing an image, and optically detecting the transparent reflecting plate in contact exposure. CONSTITUTION:The mechanism has a light source and a pair of focus detecting elements 10A and 10B, the light source emitting light onto the transparent reflecting plate plane 4 or the slide film plane 5 in order to focus, and the pair of focus detecting elements receiving the light from the light source. When an image is formed and exposed on a slide, the focus detecting elements 10A and 10B detect the slide plane and then move the holder 6A of the image-forming lens 6 in response to a detected signal to stop it at the position where the slide plane is focused. There are no slides in contact exposure, so that they detect the transparent reflecting plate plane 4, placed behide the slide, and stop the image-forming lens 6. Thus, even if the film plane is warped by the heat of the light source at the time of forming and exposing the image, the image is copied satisfactorily; and in the contact exposure, the positioning of the image-forming lens is ensured by the transparent reflecting plate.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to positioning 111j14 of an imaging lens in a copying apparatus capable of imaging exposure and contact exposure.

[Prior Art] Conventionally, this type of copying apparatus has a configuration as shown in FIG.
Slide film 10 of 35mm size etc. through 05
The transmitted light is reflected on the mirror 110 through the imaging lens 108 and the color separation filter unit 109, and the original image is projected on the monitor screen 102, and the photosensitive paper 111 is irradiated and exposed. The image is superimposed on a post-development paper 114 and passed through a developing roller 112 and a heat fixing roller 113 to obtain a copied image. In this case, focus adjustment is performed by moving the monitor screen 102 for observing the contents of the slide film 107 and the exposed surface of the photosensitive paper 111 to the imaging lens 1.
There was a method of placing the 08 at the same pressure and adjusting from pin 1 on the monitor screen surface. In addition, in slide projectors, etc., the film position is controlled by a photoelectric element (CdS).
A method was devised in which the lens holder was always held at a fixed position from the film surface by optically detecting the film.

[Problems to be Solved by the Invention] However, the former method requires a monitor screen, which increases the size of the copying apparatus, and also makes it impossible to confirm the position of the imaging lens on the screen during close exposure. Furthermore, during imaging exposure, the slide may warp due to the heat from the light source, causing the slide to be out of focus. In the latter method, when a slide film is used, the distance between the film surface and the lens holder is always kept constant, so it can deal with warping of the film, etc. However, during close exposure, the slide film is warped, and interrupters etc. The lens had to be positioned.

The present invention has been made in order to solve the above-mentioned problems, and includes a transparent reflecting plate arranged between the film surface and the light source section, and a slide film surface that is connected to a photoelectric conversion element such as CdS during imaging exposure. During close exposure, since there is no slide film, the surface of the transparent reflector plate is optically detected using CdS or the like to align the position of the imaging lens. The present invention provides a positioning mechanism for an imaging lens in a copying apparatus for both image and high-exposure functions.

[Means for Solving the Problems] In order to achieve this object, a copying apparatus for both imaging and contact exposure according to the present invention includes an exposure light source and an imaging lens that irradiates light from the light source onto the surface of a photosensitive recording medium. An imaging original is selectively mounted between the imaging lens and the exposure light source, and a contact original is selectively mounted between the imaging lens and the photosensitive recording medium. In a copying device for both imaging and contact exposure, in which an image lens is disposed so as to be able to move away from and approach the image-forming original, a transparent reflective plate for focusing the close-contact original is arranged in close proximity to the image-forming original. At the same time, a focusing light source emits focusing light toward the image-forming document surface or the transparent reflector surface; A focus detection element that receives reflected light is provided, and the f-quadrant lens is moved based on a detection signal from the focus detection element to perform focus control.

[Companion] According to the present invention having the above-described configuration, the slide surface is detected by the focus detection element at the time of focusing @exposure of the slide, and the holder of the imaging lens is moved according to the detection signal to adjust the focus. Stop at the correct position. Further, during dense@exposure, since there is no slide, the surface of a transparent reflector placed behind it is detected and the imaging lens is stopped.

[Example] Hereinafter, an example embodying the present invention will be described with reference to the drawings.

In this example, as a photosensitive recording medium, US Pat.
This is an embodiment in which the photosensitive pressure-sensitive sheet compatible with color 1 proposed in No. 99209 is used.If other photosensitive paper is used, it is necessary to make some changes to the fixing system, but the exposure system can be used as is. FIG. 1 is a schematic diagram of a copying apparatus 1 embodying the present invention. Referring to Figure 1,
The configuration of the copying apparatus 1 of the present invention will be explained. The light source unit 2 includes a halogen lamp 2A and a condenser lens 2B. On that side, a cooling fan 3 for cooling the halogen lamp 2A and condenser lens 2B is arranged. A transparent reflective plate 4 is arranged in front of the condenser lens 2B. The material of the transparent reflective plate 4 may be polycarbonate, glass, acrylic, or the like. A slide film 5, which is an image forming original, is placed in front of the light-transmitting reflector 4.
An imaging lens 6 is arranged. A lens holder is not shown in FIG. FIG. 2 is a diagram showing the principle of the autofocus device employed in this embodiment.

In FIG. 2, the imaging lens 6 is held by a lens holder 6A, a rotary gear 26 is engaged with a rack 25 on the outer surface of the holder 6A, and a rotary gear 27 coaxial with the gear 26 is connected to the drive motor 11. A drive gear shaft 28 is engaged with the drive motor 11.
The imaging lens 6 is configured to move forward and backward toward the slide film 5 by driving. Further, a focusing light source 7 that emits focusing light toward the 4 surfaces of the transparent reflector or the 5 surfaces of the slide film, and a pair of focus detection elements (CdS) 10A that receive light from the light source 7, I
An OB is provided. The optical system includes 8 condenser lenses.
and an objective lens 9 are provided, and the objective lens 9 is attached to the tip edge of the boulder 6A of the imaging lens 6.

However, if the 5 sides of the slide film warp due to the heat in the atmosphere during imaging exposure, or if the slide surface moves for some other reason, only one of the CdS will be exposed to light, and the resistance of the CdS will be different. will occur. This difference is amplified and the lens holder drive motor 11 is rotated to the left or right to maintain a constant distance between the film 5 surface and the lens holder 6A.Returning to FIG. 1, the color separation filter unit 12 is for selectively transmitting only light in a predetermined wavelength range from the light that has passed through the slide 5, and exposing the photosensitive recording medium. The light is applied to the surface of the photosensitive recording medium 15 on the surface of the document table 14 through the mirror 13 . A sheet roll 16 around which an unused photosensitive recording medium 5 is wound.
is stored in a cassette 17. The sheet winding roller 18 is for winding up the capsule sheet after use, and is rotated by a drive motor (not shown). The pressure developing roller 19 is used to visualize a latent image formed on the photosensitive recording medium 15 by the amount of hardened microcapsules on the color developing paper 24. To explain the principle of color development, the hardened microcapsules that are exposed to light in the sensitive wavelength range are not destroyed even when they pass through the pressure developing roller 19, and only the unhardened microcapsules are destroyed when they are passed through the pressure developing roller 19. , the dye precursor encapsulated in the capsule and the color developing paper 24
The color developer applied to the surface reacts and develops color. The heat fixing roller 20 is used to promote color development reaction on the color developing paper 24. 21 is a paper feed cassette containing developer paper 24, 22
is a paper feed roller that feeds the developing paper to the conveyance path. 23
is a paper discharge port for discharging the developer paper 24 after development. The contact original is placed between the photosensitive recording medium 15 and the 14th original, and the original insertion opening is provided on the side of the apparatus (not shown).

Next, the operation will be explained with reference to FIGS. 1 and 2.

First, the case of imaging exposure of a slide or the like will be explained.

The power source of the copying apparatus 1 is turned on and the imaging exposure mode is specified from a switch panel (not shown). At the same time as the power is turned on, a microswitch (not shown) is used to detect whether the color separation filter 12 is in a predetermined position or the origin is detected, and when the origin is detected, the copying becomes possible. When the slide surface holder 5 is set at a predetermined position and a copy button (not shown) is pressed, the light source 7 is turned on and the light is focused onto the slide surface via the condenser lens 8. The reflected light of the focused light is imaged by the objective lens 9 onto the Cd510A and IOB. At this time, if the position of the lens holder 6A is deviated from the predetermined position from the film surface, the Cd510A, IO
The balance of how light hits B is out of balance, Cd510A
, a difference occurs in the resistance of IOB. The lens holder drive motor 11 is rotated until this difference disappears. After the operation is completed, the halogen lamp 2A is turned on for a predetermined exposure time. The light emitted from the halogen lamp 2A is transmitted through a condenser lens 2B, a transparent reflector 4, a slide 5, an imaging lens 6,
The light reaches the photosensitive recording medium 15 through the color separation filter 12, the mirror 13, and the document table 14, and only the light that has passed through the color separation filter 12 of the image on the slide exposes the photosensitive recording medium 15. At this time, the greater the amount of light (energy) reaching the photosensitive recording medium 15, the more the microcapsules become hardened. When the halogen lamp 2A is turned off, the next color separation filter 12 is switched on, and the halogen lamp 2A is turned on again for a predetermined period of time. The photosensitive recording medium 15 is exposed in the same manner as the previous color separation filter 12, and the same operation is repeated a predetermined number of times.

When the exposure operation is completed, an image of the slide is formed on the photosensitive recording medium 15 as a latent image corresponding to the amount of hardening of the microcapsules. Next, the color developer paper 24 in the paper feed cassette 21
is conveyed by the paper feed roller 22. At this time, the photosensitive recording medium 15 is also wound up by the sheet winding roller 18 in synchronization with the feeding amount of the color developing paper 24. Exposed area and developer paper 2
4 are overlapped and passed between the pressure developing rollers 19 to destroy uncured microcapsules on the photosensitive recording medium 15. Thereafter, the photosensitive recording medium 15 is transferred to the sheet winding roller 1
8, the developer paper 24 is conveyed to the heat fixing roller 20, and after passing through the heat fixing roller 20, the developer paper 24 on which the visible image has been formed is discharged from the discharge port 23, and the copying operation of the imaged original is carried out. finish.

Next, the copying operation of a close-contact original will be explained. A close contact original is set between the photosensitive recording medium 15 and the original table 14 from the side of the apparatus. Set to close document exposure mode and press the copy button (not shown)
Press. Then, the origin of the color separation filter 12 is detected, and the lens holder 6A is positioned in the same way as in the previous operation so that the distance between the transparent reflection plate 4 and the lens holder 6A is constant. When the lens holder 6A is set in a predetermined position, a copying operation similar to that for the imaging original is performed,
Copying of the close-contact original is completed.

It should be noted that the present invention is not limited to the embodiments detailed above, and various changes can be made without departing from the spirit thereof. For example, in this embodiment, a photosensitive pressure-sensitive sheet is used as the photosensitive recording medium, but this need not be used. Further, in this embodiment, multiple exposures are performed using a color separation filter, but a monochrome original may be copied using a single exposure using a color correction filter. Further, although the copying apparatus is not provided with a monitor screen in this embodiment, it may be provided with a monitor screen. Further, the transparent reflector may be attached to the main body of the copying apparatus or may be attached to a slide holder or the like. Although the lens holder 6A is driven by a rack and a pinion, it is not necessary to use this method, and a cam mechanism may be used. Furthermore, the transparent reflector does not need to cover the visible wavelength range, and may have some kind of filter effect.

[Effects of the Invention] As is clear from the detailed description above, according to the present invention, since the lens holder is held at a fixed position from the sliding surface or the transparent reflector, the film surface is prevented from warping due to the heat of the light source during imaging exposure. In addition, during close exposure, the imaging lens can be reliably positioned using the transparent reflecting plate. Further, by using a transparent reflector, there is no need to position the lens using an interrupter or the like, and the configuration can be simplified and the cost of the device can be reduced.

[Brief explanation of the drawing]

1 to 3 show embodiments embodying the present invention. FIG. 1 is a schematic configuration diagram of a copying apparatus to which this embodiment is applied, and FIG. FIG. 3, which shows the applied positioning mechanism, is a schematic diagram of a conventional copying apparatus. In the figure, 2 is a light source unit, 4 is a transparent reflector, 5 is a slide film, 6 is an f-elephant lens, 7 is a focusing light source, and IO
A and IOB are focus detection elements, and 15 is a photosensitive recording medium.

Claims (1)

[Claims] 1. A light source for exposure, and an imaging lens that irradiates the light from the light source onto the surface of a photosensitive recording medium, and an image forming original is placed between the imaging lens and the light source for exposure, and an image forming lens is provided. A contact document is selectively mounted between each lens and the photosensitive recording medium, and the imaging lens is disposed so as to be able to move away from and approach the image document. In the apparatus, a transparent reflector for focusing the close-contact original is disposed in close proximity to the image-forming original, and a focusing device emits light for focusing toward the image-forming original surface or the transparent reflector surface. and a focus detection element that receives light emitted from the focusing light source and reflected by the image forming document surface or the transparent reflection plate surface, and based on the detection signal of the focus detection element. A positioning mechanism for an imaging lens in a copying apparatus for both an imaging type and a contact type, which is configured so that the imaging lens moves and performs focusing control.