JP2603237B2 - Imaging device - Google Patents

Description

Detailed Description of the Invention

B. Object of the invention [Industrial field of use] The present invention relates to a photographing device for sequentially photographing and recording image information on a long film. [Prior Art] A typical example of the above-described image capturing apparatus is a rotary camera. Hereinafter, this rotary camera will be described as an example. In a rotary camera, the subject and film are synchronized with the reduction ratio,
Since both of them are moving and continuously shooting while exposing through the slit, rapid mass shooting and long shooting are possible. The subject sent from the paper feed port is conveyed at a constant speed and passes through the exposure unit. At this time, the image of the subject illuminated by the lamp is formed on the film surface by the lens through the slit. Also, in most rotary cameras, the both sides of the conveyed object are illuminated at the same time, and images of both sides are taken simultaneously (duplex method). Two mirrors are provided. In addition, several other mirrors have been used to fold the optical path in order to keep the entire device in a convenient size and shape. [Problems to be Solved by the Invention] However, in the rotary camera as described above, in order to secure an optical space for securing an optical path, a mirror and a supporting member for fixing the mirror, etc. The size of the physical space occupies a large proportion of the size of the entire device, and these spaces are major factors that hinder the downsizing of the device. Further, the number and arrangement method of the mirrors are also factors that influence the size of the entire apparatus, but generally, the contrast of the image is slightly reduced each time the light is reflected by the mirrors,
Since each mirror requires time-consuming and costly alignment and adjustment, it is practically problematic to unnecessarily increase the number of mirrors or disperse the individual mirrors into a complicated mirror arrangement. The present invention has been made to solve the above problems, and an object of the present invention is to obtain an image pickup apparatus in which an optical space for securing an optical path is small and a mirror can be easily attached, assembled and adjusted. .. B. Structure of the Invention [Means for Solving the Problems] In the present invention, the reflecting surfaces are arranged on both sides of the subject exposure section at an angle of 45° with respect to the subject transport surface.
A pair of first mirrors, and second mirrors to fourth mirrors that sequentially reflect the reflected light from the pair of first mirrors and guide images on both the front and back surfaces of the subject to the image forming unit. The first mirror and the second mirror of the pair are arranged on the same plane, the third mirror and the fourth mirror are arranged opposite to each other across the plane, and are arranged on the same plane by the first mirror. An optical path surface formed by the light reflected and reaching the second mirror and an optical path surface formed by the light reflected by the third mirror and reaching the fourth mirror intersect perpendicularly. It is an image capturing device. [Operation] In addition to the two first mirrors arranged at the same positions on both sides of the exposure part of the subject, the photographing device according to the present invention includes second, third,
By mounting the fourth three mirrors adjacent to each other to form an optical path, the optical space can be downsized, and by mounting the three mirrors together as a unit, mounting, assembling, adjustment of the mirrors, etc. Is a simplified version of. EXAMPLES Examples of the present invention will be described below with reference to the drawings. First
FIG. 1 is a side view showing one form of a subject transport system of the image capturing apparatus 1 according to the present invention. When the subject 2 is placed on the paper feed tray 3 which is inclined downward, gravity moves in the direction of arrow A. The subject 2 is separated and fed one by one by a paper feed roller 4 rotating in the arrow B direction and a reverse rotation roller 5 rotating in the arrow C direction. A lower belt 8 is wound around the belt rollers 7 and 12, an appropriate tension is held by a tension roller 11, and the subject 2 is conveyed by the lower belt 8 by the rotation of the lower drive roller 10. The idler roller 6 and the guide unit 9 are the subject 2
Is pressed against the lower belt 8 and held. The subject 2 is conveyed from the horizontal direction to the vertical direction by the lower belt 8 and passes through the subject guide glass 23. The subject 2 is an illumination lamp 22 when passing through the subject guide glass.
・22' illuminates both sides simultaneously. Nip rollers 13 and 14 are provided above and below the guide glass 23. Further, an upper belt 19 is wound around the belt rollers 16 and 18, an appropriate tension is held by a tension roller 17, and the rotation of the upper drive roller 20 conveys the subject 2 that has passed through the guide glass. The idler roller 15 presses the subject 2 against the upper belt 19 and holds it. The subject 2 switches the transport path from the vertical direction to the horizontal direction by the upper belt 19, travels in the direction of arrow D, and is discharged to the stacking hopper 21. In addition, on both sides of the subject guide glass 23, which is the exposure unit, first mirrors 24, 24' are arranged symmetrically with respect to the plane of the subject 2 which moves in the vertical direction, each of which forms an angle of 45° to the left and right. Has been done. The first mirrors 24, 24' are supported by a base structure (not shown) inside the apparatus main body 1 similarly to the above-mentioned roller shaft for conveying the subject. FIG. 2 is a perspective view of a mirror structure showing the optical system of the present invention. In the exposure unit, the images on both sides of the subject 2 illuminated by the illumination lamps 22 and 22' are reflected by the first mirrors 24 and 24' and pass through the slits 25 and 25' of the slit plate.
The image passing through the slits 25 and 25' is reflected obliquely downward by the second mirror 26. The image is reflected vertically upward again by the third mirror 27 and then obliquely downward by the fourth mirror (final mirror) 28. The image reflected by the fourth mirror 28 passes through the image forming lens 29 and is formed on the film 30. Exposure part of subject 2, first mirror 24, 24', slit 25
25', the second mirror 26 is arranged on the same plane. That is, it is reflected by the first mirror 24, 24',
The optical path surface AA' formed by the light reaching the second mirror 26
BB' is in the same plane. Further, the third mirror 27 and the fourth mirror 28 are arranged on the same plane, and the optical path plane CC'DD' formed by the light reflected by the third mirror 27 and reaching the fourth mirror 28 is on the same plane. is there. The optical path plane AA'BB' is a horizontal plane, and the optical path plane CC'D
D'is a plane that intersects this at a right angle. Also, the plane DD′E
E'is also the same plane as plane CC'DD'. FIGS. 3 and 4 are a side view and a front view showing the arrangement of the second, third and fourth mirrors 36, 37 and 38 according to the present invention except the first mirror. These three mirrors 26・27・28
The three mirrors 26, 27, and 28 can be collectively attached to the mirror holding table 31 as shown in the figure, since the two are in close proximity to each other. The mirror holder 31 has a structure that does not interfere with the optical path formed by the reflection of the three mirrors inside. In the above-described embodiment, since the subject is conveyed in the exposure unit in the vertical direction, the exposure unit and the first mirrors 24 and 24' and the slits 25 and 25' and the second mirrors located on both sides of the exposure unit are naturally located. Are arranged on the same horizontal plane, but the carrying direction of the subject in the exposure unit may be set to any direction other than the vertical direction. In this case, as shown in FIGS. 5 and 6, the above-mentioned optical path surface AA'BB' is not a horizontal plane but a plane having an arbitrary inclination. As described above, according to the present invention, in addition to the two first mirrors arranged at the same position on both sides of the exposure part of the subject, the reflected light from the pair of first mirrors is Second mirrors to fourth mirrors that sequentially reflect the images of the front and back surfaces of the subject to the image forming unit are provided, and the pair of first mirrors and second mirrors are arranged on the same plane. A third mirror and the fourth mirror are arranged opposite to each other across the plane and are arranged on the same plane, and are formed by an optical path surface formed by the first mirror and the second mirror and a third mirror and the fourth mirror. Since the optical path and the optical path intersect perpendicularly to each other, the optical space and the device body can be downsized. Further, by holding the three mirrors of the second mirror to the fourth mirror together in one structure (holding table), there is an effect that mounting, assembling, adjustment and the like of the mirrors are facilitated.

[Brief description of drawings]

FIG. 1 is a side view showing a subject transport system of an image pickup apparatus according to an embodiment of the present invention, FIG. 2 is a perspective view of its optical system, FIG. 3 is its side view, FIG. 4 is its front view, and FIG. FIG. 6 is a side view showing a subject transport system of an image pickup apparatus according to another embodiment, and FIG. 6 is a side view of the optical system thereof. 2……Subject, 24/24′……First mirror, 25・25′……
Slit, 26...Second mirror, 27...Third mirror, 28...
… 4th mirror, 29…… Imaging lens, 30…… Film, 31
…… Mirror holder.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-59-94750 (JP, A) JP-A-53-37416 (JP, A) JP-A-55-60938 (JP, A)

Claims (2)

(57) [Claims] 1. Reflecting surfaces are arranged on both sides of a subject exposing portion at an angle of 45° with respect to a subject conveying surface, respectively.
A pair of first mirrors, and second mirrors to fourth mirrors that sequentially reflect the reflected light from the pair of first mirrors and guide images on both the front and back surfaces of the subject to the image forming unit. The first mirror and the second mirror of the pair are arranged on the same plane, the third mirror and the fourth mirror are arranged opposite to each other with the plane in between, and are arranged on the same plane. The optical path surface formed by the light reflected by one mirror and reaching the second mirror and the optical path surface formed by the light reflected by the third mirror and reaching the fourth mirror intersect perpendicularly. Imaging device characterized by. 2. The image pickup apparatus according to claim 1, wherein the second mirror to the fourth mirror are integrally held by a supporting member.