JP3307419B2 - Optical device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical device for optically reading an object such as a document placed on a contact glass, and more particularly, to an optical device placed away from the contact glass. The present invention relates to an optical device that can focus on an object.

[0002]

2. Description of the Related Art An optical device for optically reading an object such as a manuscript is applied to a copying machine, an instant photographic device and the like for forming an image of the object. For example, an optical device applied to a copier optically reads a document (object) placed on a contact glass by irradiating light from a light source, and reads the read light through a plurality of mirrors and lenses. Projected on the photoconductor. Such an optical device generally changes the optical arrangement of a plurality of mirrors and lenses, and changes the distance between the lens and the object (object-side distance).
By changing the ratio of the distance between the lens and the image (image-side distance), the magnification for reading the object can be changed.

[0003]

However, according to the conventional optical device, the object side distance is set between the lens and the contact glass on which the object is placed. In other words, the position of the object is specified in advance. When reading an object located far away from the contact glass,
There is a problem that the focus and the magnification cannot be adjusted to form a blurred image, and that an image with the set magnification cannot be obtained.

In an instant photographic apparatus or the like using a photosensitive sheet containing a silver salt, a single exposure process can provide a full-color image with dense pixels and excellent gradation without color shift. . For this reason, there has been a demand for placing an object (three-dimensional object) on the contact glass in addition to the sheet document to obtain an image of the placed object.

The present invention has been made in view of the above, and an object of the present invention is to obtain a desired image with clear image quality by reading in accordance with the shape of an object and the position where the object is placed.

[0006]

According to the present invention, in order to achieve the above object, the contact glass and the image point position are fixed, the conjugate length from the object point to the image point is changed, and the image is focused. An optical device that forms an optical image of an object at an object point at a desired magnification at a point, and parallels the object placed on the contact glass to the contact glass while maintaining a distance between the object point and the lens. A scanning unit for scanning an optical image of the object at the object point into the lens, and, if the position of the object point on the object is distant from the contact glass, the distance from the contact glass at the position Input means for inputting (h1), and an optical mirror by an adjusting mirror for adjusting a movement amount Z1 of the lens and an optical distance disposed between the lens and the image point position based on the distance (h1) input by the input means. Distance change Z1 = X- (X1-h2) = (1-k / m) f + h2 Z2 = (X + Y)-(X2-h1 + Y1) = (m + 1 / m-k-1 / k) f + h1, where m; Magnification to be adjusted f; Focal length of lens k: Magnification at position where object is focused h1; Distance from position where object is focused to contact glass h2: Distance from position where object is adjusted to focus to contact glass Distance X; object-side distance from lens to contact glass when focus and magnification m are adjusted to contact glass X1; object-side distance from position to adjust magnification of object to lens X2; from position to focus object Object-side distance to lens Y; Image-side distance from lens to image point when lens is focused and magnification m on contact glass Y1: Double object And control means for controlling the arrangement of the lens and the adjusting mirror so as to satisfy the relationship of the image side distance from the lens to the image forming point when the magnification m is adjusted to the position where is adjusted. is there.

[0007]

In the optical device according to the present invention, the position at which the object (three-dimensional object) is focused and the position at which a desired magnification is to be obtained are input via the input means, and the control means responds to the input information. To change the optical arrangement of the plurality of mirrors and lenses.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of a positive sheet assembly, the construction of a negative film and a negative film cartridge, the construction and operation of the entire apparatus, and a schematic block diagram of the instant photographic apparatus to which the embodiment according to the present invention is applied will be described. ) Will be described in detail with reference to the drawings.

The positive sheet assembly is provided with accessory parts such as a pod in which developer is sealed in a positive sheet (image receiving sheet) and a trap mask for holding excess developer after extension. Use as

FIG. 1 shows a positive sheet assembly 100.
Is shown. As shown in the figure, a positive sheet assembly 100 includes a black reader 102 attached to a front end portion of a positive sheet 101 on an image receiving surface side, a pod 103 containing developer and attached on the leader 102,
A tip mask 104, both side masks 105, and a trap mask 106, which are provided to improve the image at the end of the image area of the positive sheet 101 (the area axb shown in FIG. 1). And a rail member 107 attached to the side mask 105.

Here, the developer flowing out of the pod 103 is configured to be uniformly spread on the positive sheet 101 with a thickness substantially equal to the thickness of the rail member 107 and both side masks 105.

The amount of the developer is larger than that required for image formation so as to sufficiently spread to the rear end of the image area.
It is enclosed inside. Excess developer is evenly spread to the rear end of the image area, and is then stored between the trap mask 106 (part D in FIG. 1) and a negative film 200 (part D ′ in FIG. 2) described later. This prevents excess developer from protruding into the apparatus and adhering to the developing roller, the transport path, and the like, thereby causing contamination.

Configuration of Negative Film and Negative Film Cartridge As shown in FIG. 2, a negative film (long photosensitive sheet) 200 wound into a roll is used as the photosensitive member. The negative film 200 is made of a photosensitive band-like material containing a long (for example, 36 sheets) silver salt containing silver salt, and is wound in a roll shape with the latent image forming surface (photosensitive surface) inside and a negative film cartridge. 201 (see FIG. 3).
The negative film cartridge 201 is resin-molded in a cylindrical shape including the roll-shaped negative film 200.
In order to facilitate molding and loading of the negative film 200, the structure is divided into two planes including an axis. It should be noted that l in FIG. 2 indicates a length at which an image can be formed.

FIG. 3 shows the entire configuration of an instant photo apparatus (peel-apart type) to which the present embodiment is applied. Position (exposure surface)
The negative film 200 is conveyed and exposed at the predetermined position, and is further aligned with and overlapped with the positive sheet assembly 100, and the developer is spread therebetween, and an image is formed on the positive sheet assembly 100. And a transfer unit 302 for transferring and forming the image.

The optical system unit 301 includes a contact glass 303 and a first traveling body 3 including a first mirror and a light source.
04, a second traveling body 305 including a second mirror and a third mirror, a third traveling body 307 including a lens 306, a fourth mirror, and a fifth mirror, and a sixth mirror 308.

Here, a fluorescent lamp is used as a light source included in the first traveling body 304 and irradiates an original placed downward on the contact glass 303 while scanning the original parallel to the contact glass 303. At this time, the second traveling body 305 is moved to the first
By scanning in the same direction at half the speed of the traveling body 304, the optical path length is kept constant. Also, the lens 306
In addition, the magnification and the conjugate length during zooming are adjusted by moving the third traveling body 307.

As shown in the figure, the reflected light of the original is divided into first, second, and
Then, the light is reflected by the third mirror, and further passes through the lens 306 and the fourth, fifth, and sixth mirrors, and is subjected to slit exposure at the exposure position A.

The transport unit 302 includes a photosensitive negative roll film (negative film 200) feeding section, a negative film cutter section for cutting the fed negative film 200, and a negative film transport / exposure section for transporting and exposing the negative film 200. It comprises an exposure section, a positive sheet assembly transport section, and a development section. Hereinafter, negative film 20
0 (not shown), the configuration of the negative roll film feeding section, negative film cutter section, and negative film transport / exposure section will be described in detail.

The negative film 200 accommodated in a roll in the negative film cartridge 201 is passed between the rotary blade 313a and the fixed blade 313b by a pair of draw-out rollers 312a and 312b, and is conveyed onto a guide plate 314. It is sent to a pair of rollers 315a and 315b. Sensor S disposed near intermediate roller pair 315a, 315b
Reference numeral 2 denotes an infrared reflection type sensor for detecting a jam of a sheet pulled out from the negative sheet cartridge 201.

When the leading end of the conveyed negative film 200 is detected by the sensor S1 at the exposure position A (or a predetermined time after the detection), the first traveling body 304 and the second traveling body 305 start scanning. Then, after the negative film 200 is nipped by the pair of intermediate rollers 315a and 315b, exposure and latent image formation are performed at the exposure position A on the guide plate 314.

Here, assuming that the transport speed of the negative film 200 at the time of exposure / latent image formation is V _N , the traveling speed of the first traveling body 304 is V ₁ , and the copy magnification is m, the negative film 200 is formed.
Conveying speed V _N of is controlled so as to satisfy the relationship of _{V 1 = V N × 1 /} m.

The exposure position A is a flat surface over the slit area, and the pull-out roller pair 312a, 31
2b and the nip height of the pair of intermediate rollers 315a, 315b is equal to or higher than the nip height. Furthermore,
Intermediate roller pair 315a, 315b and pull-out roller pair 3
The peripheral speeds of 12a and 312b are almost the same.
After a predetermined period of time (after the nip between the intermediate roller pair 315a and 315b or the timing at which the exposure is started), the driving of the pull-out roller pair 312a and 312b is stopped, and an appropriate load is applied. Become free with. As a result, the negative film 200 is slightly pulled on the exposure position A, and the guide plate 314 is pressed.
It can be conveyed in a state in which it is in close contact with the upper side, and the optical path length and the conveying speed up to the surface of the negative film 200 can be kept constant.

The negative film 200 on which the exposure / latent image has been formed for a certain length is temporarily stopped, and thereafter, the rotary blade 313 is rotated.
When a rotates while contacting the fixed blade 313b, it is cut into a sheet. The timing of stopping the negative film 200 is determined by counting the time t after the sensor S1 detects the leading end of the negative film 200.

Accordingly, the trailing end of the cut negative film 200 is not subjected to exposure and latent image formation (in other words, exposure and latent image formation cannot be performed). Specifically, the rear end portion of the negative film 200 corresponding to at least the distance from the exposure position A to the front end of the fixed blade 313b (this distance is defined as G) is in an unused state, that is, unnecessarily wasted. Part. For this reason, the exposure position A and the cutter are adjusted so that the distance G is smaller than the distance D '(see FIG. 2) from the rear end of the positive sheet assembly 100 to the rear end of the image portion transferred onto the positive sheet 101. (Rotary blade 313a and fixed blade 313b) are disposed to reduce waste of unnecessary portions (rear end) not used for image formation of negative film 200.

Similarly, the leading end of the cut negative film 200 is also moved at least from the exposure position A to the intermediate roller pair 31.
Exposure and latent image formation cannot be performed over a distance longer than the distance to H. 5a and 315b (this distance is H).
From the end of the negative film 200 to the negative film 20.
If the exposure position A and the pair of intermediate rollers 315a and 315b are arranged so as to be smaller than the distance C '(see FIG. 2) to the leading end of the latent image portion formed on the zero, the waste of the negative film 200 can be reduced. Can be.

Further, as described above, by cutting the negative film 200 after the exposure is completely completed, a change in the transport speed due to the impact of cutting can be avoided as compared with, for example, cutting during the exposure. And stable transportation can be performed. The cut negative film 200 is turned by about 180 ° by a pair of rollers 316a and 316b and a guide member 317, and then the guide plates 318a and 318 are turned.
b, and further conveyed by the roller 320 until the leading end of the roller 320 hits the roller pair 321 (here, the stopped state).

Next, the transport operation of the positive sheet assembly 100 will be described, and the configuration of the positive sheet assembly transport section will be described in detail. Actually, the transport operation of the positive sheet assembly 100 is performed by the negative film 20 described above.
This is performed before the transport, exposure, and cutting operations of 0. Unlike the negative film 200, the positive sheet assembly 100 has no photosensitivity and can be inserted from outside the apparatus. In the instant photographic apparatus to which this embodiment is applied, the positive sheet assembly 1 is used to make the apparatus compact and inexpensive.
00 is manually inserted one by one into the left side of the figure along the guide plate 311 at the lower right of the apparatus main body from an insertion port described later.

When the positive sheet assembly 100 is inserted along the guide plate 311 and both side guides (not shown), and the leading end is detected by the sensor S5, the insertion roller pair 322 rotates. The rollers of the insertion roller pair 322 are arranged so as to grip only the outer ends of the pod 103 so as not to crush the developer pod 103 (see FIG. 1) attached to the tip of the positive sheet assembly 100. Positive sheet assembly 100
The guide plates 323a, 323b are formed by the insertion roller pair 322.
And is stopped at a predetermined position to enter a standby state.
The printing operation becomes possible. The stop timing is obtained by counting the time t 'from when the sensor S6 detects the leading end of the positive sheet assembly 100.

Here, when a predetermined print switch is pressed, the transport, exposure and cutting operations of the negative film 200 described above are executed. The negative film 200 that has come into contact with the stopped roller pair 321 is bent by a fixed amount between the guide plate 319 and the guide plate 318b by the conveying force of the roller pair 320. After the predetermined amount of the negative film 200 has been bent, the guide plates 324a, 32
4b. The rotation start of the roller pair 321 is obtained by counting the time from when the sensor S3 detects the leading end of the negative film 200. By deflecting the negative film 200 in this manner, the skew correction is performed by aligning the leading edge of the negative film 200 with the nip of the roller pair 321. The tip of the negative film 200 conveyed by the rotation of the roller pair 321 is detected by the sensor S4, and is conveyed to the nip of the developing rollers 325a and 325b. At the timing from the detection of the sensor S4, first, the insertion roller pair 322 rotates to stop the developing roller 325a in which the positive sheet assembly 100 is stopped.
The skew correction is performed as in the case of the negative film 200. After that, the developing rollers 325a and 32
5b starts rotating.

Next, the positive sheet assembly 100 waiting at a predetermined position is conveyed first, and then the leading end of the negative film 200 reaches the nip of the developing rollers 325a and 325b by the rotation of the roller pair 321. It is transported at the peripheral speed of the developing rollers 325a and 325b. At this time, a gap J occurs at the leading end of the positive sheet assembly 100 and the leading end of the negative film 200.
It is controlled to be at least smaller than C in FIG. This makes it possible to shorten the length of the negative film 200 that is cut by the amount of the shift J, compared to a type in which the leading end of the negative film 200 and the leading end of the positive sheet assembly 100 are conveyed. it can.

The developing rollers 325a and 325b rotate while breaking the pod 103 to cause the developer to flow out and extend the developer flowing between the positive sheet assembly 100 and the negative film 200. Developing roller 325
a, positive sheet assembly 10 that has passed through 325b
0 and the negative film 200, the tray 326 and the lid 3
27 and is discharged to a dark box composed of When the positive sheet 101 is a transparent member (for example, an OHP sheet) or a thin member, the dark box
The cover 327 is rotatably and removably supported by the support shaft 328 so as to prevent a good image from being obtained due to exposure of the image 00. Further, a sensor S7 for detecting the negative / positive joined body transported from the developing roller pair 325a, 325b is provided.

As shown in FIG. 1, the length L in the width direction of the pod 103 on the positive sheet assembly 100 is shown.
Is equal to or shorter than the width b of the image area so as not to be broken by being pressed against a roller or the like during conveyance. For this reason, after the pod 103 is cleaved at the portion F, a certain distance (the distance indicated by E in the figure) is required until the pod 103 extends to the image area width b. Further, as described above, the displacement J when the negative film 200 and the positive sheet assembly 100 are combined is as follows.
Pod 10 from the tip of the positive sheet assembly 100
The distance C ′ from the tip of the negative film 200 to the tip of the latent image portion in FIG. 2 should be at least from the split portion of the pod 103 to the tip of the image forming portion in FIG. Should be longer than the distance E.

Schematic Block Diagram Next, referring to the schematic block diagram shown in FIG.
A configuration centering on 01 will be described. The control unit 401 includes
An operation unit 402 for displaying a message, key input, and the like
And a switching power supply 403 for supplying power to the device main body.
A main motor 404 for driving the negative film 200, a cutter, rollers, and the like;
4. Each traveling body such as the second traveling body 305 and the lens 306
, A mirror motor 406 for moving a mirror at the time of zooming, a lens motor 407 for moving a lens 306 at the time of zooming, a clutch and solenoids 408 for controlling operation of various driving systems, A fluorescent lamp stabilizer 409 for obtaining a stable light amount, a fluorescent lamp 410 (light source of an optical device), a sensor S8 for detecting the light amount of the fluorescent lamp 410, and various sensors (including S1 to S7)
And are connected.

The operation of the above-described configuration will be described by taking as an example the arrangement control of the optical system unit 301 of the optical system according to the present embodiment. In the instant photographing apparatus to which the present embodiment is applied, when a magnification at the time of zooming is input via the operation unit 402, the optical arrangement of the lens 306 and the third traveling body 307 according to the input magnification. By changing
A desired magnification is obtained. Figure 5
As shown in (a), when the value of the magnification is m, the third traveling body 307 and the lens 306 are moved using the mirror motor 406 and the lens motor 407, and the object side between the contact glass 303 and the lens 306 is moved. By setting the distance to X and the image-side distance between the lens 306 and the negative film 200 to Y, a desired magnification m is obtained.

At this time, the object side distance X and the image side distance Y are
Assuming that the focal length of the lens 306 is f, the following positional relationship is satisfied. m = Y / X1 / X + 1 / Y = 1 / f

Accordingly, the object is contact glass 303
If the position is far from the camera, the above-mentioned positional relationship is not satisfied, so that the desired magnification m cannot be obtained, and the formed image becomes blurred. For this reason, in the present embodiment, the position at which the object is to be focused and the position at which the desired magnification m is to be obtained are input via the operation unit 402. Specifically, for example, as shown in FIG. 5B, if the point P is a position to be focused and the point O is a position to be adjusted to the magnification m, the contact glass 30
Distance h1 from 3 to point P, and contact glass 3
The distance h2 from 03 to the point O is input.

The control unit 401 moves the lens 306 using the lens motor 407 and the third traveling body 307 using the mirror motor 406 according to the information input via the operation unit 402. . At this time, distance X1 from lens 306 to point O
Assuming that the distance X2 is the distance X2 and the image side distance is Y1, the positional relationship of 1 / X2 + 1 / Y1 = 1 / fm = Y1 / X1 must be satisfied.

If the magnification at the point P is k, the above-mentioned positional relationship is as follows. X2 = (1 + 1 / k) f, Y1 = (1 + k) f X1 = 1 / m · (1 + k) f, Y1 = (1 + k) f

Therefore, if h1−h2 = Δh, then X2−Δh = (1 + 1 / k) f−Δh = 1 / m · (1 + k) f. When mk / f is multiplied by the above equation, mk + m−mkΔh / f = k + k ^2, and becomes the organizing and ^{k 2 + (1 + mΔh /} f-m) k-m = 0.

Here, when a solution is obtained with (1 + mΔh / fm) = α, k becomes a value shown in Expression 1.

(Equation 1)

Since k> 0, the sign before the square root shown in Expression 1 is only +. Therefore, the contact glass 30
The distance Z1 that the lens 306 moves from the position where the lens 3 is focused at the same magnification m with respect to 3 is as follows: Z1 = X- (X1-h2) = (1 + 1 / m) f-1 / m · (1 + k) f + h2 = (1−k / m) f + h2

Similarly, the distance Z2 that the third traveling body 307 moves is Z2 = ((X + Y)-(X2-h1 + Y1)) / 2 = ((1 + 1 / m) f + ( 1 + m) f- (1 + 1 / k) f + h1- (1 + k) f) / 2 = ((m + 1 / m-k-1 / k) f + h1) / 2

The control unit 401 calculates by substituting the value of k in Equation 1 into the equations for obtaining these Z1 and Z2,
06 is moved leftward in FIG. 3 by Z1 and the third traveling body 307 is moved Z2 in the same direction as the lens 306, so that a desired image can be obtained with clear image quality.

When the object is at a position away from the contact glass, the reflected light also becomes smaller in accordance with the distance at which the object is away from the contact glass. It is desirable to increase the light amount of the light source according to the distance h1 to be adjusted (see FIG. 5B).

[0045]

As described above, according to the present invention, a desired image can be obtained with a clear image quality by reading in accordance with the shape of the object and the position where the object is placed.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of a positive sheet assembly used in an instant photo apparatus to which an embodiment of the present invention is applied.

FIG. 2 is an explanatory diagram showing a configuration of a negative film used in an instant photographic device to which an embodiment of the present invention is applied.

FIG. 3 is a schematic cross-sectional view illustrating a configuration of an instant photographic device to which an embodiment of the present invention is applied.

FIG. 4 is a block diagram illustrating a configuration of an instant photo apparatus to which an embodiment of the present invention is applied.

FIG. 5 is an explanatory diagram showing an arrangement control method of the optical system unit according to the embodiment.

[Explanation of symbols]

301 optical system unit 303 contact glass 304 first traveling body 305 second
Traveling object 306 Lens 307 Third
Running body 308 Sixth mirror 401 Control unit 402 Operation unit 406 Mirror motor 407 Lens motor

Continuation of the front page (72) Inventor Masahiro Ishikawa 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. (56) References JP-A-57-191653 (JP, A) JP-A-63-167343 (JP, A) JP-A-57-192972 (JP, A) JP-A-61-44655 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03B 27/34

Claims (1)

(57) [Claims] 1. A contact glass and an image point position are fixed, a conjugate length from an object point to an image point is changed to focus, and an optical image of an object at the object point at a desired magnification is adjusted at the image point. An optical device for forming an image, wherein an object placed on a contact glass is scanned in parallel with the contact glass while maintaining a distance between the object point and the lens, and an optical image of the object at the object point is applied to the lens. A reading unit for inputting light; input means for inputting a distance (h1) of the position from the contact glass when the position to be an object point on the object is far from the contact glass; Based on the distance (h1), the lens movement amount Z1 and the optical distance change amount Z by the optical distance adjustment mirror disposed between the lens and the image point position.
Z1 = X- (X1-h2) = (1-k / m) f + h2 Z2 = (X + Y)-(X2-h1 + Y1) = (m + 1 / m-k-1 / k) f + h1, where m; Magnification to be adjusted f; Focal length of lens k: Magnification at position where object is focused h1; Distance from position where object is focused to contact glass h2: Distance from position where object is adjusted to focus to contact glass Distance X; object-side distance from lens to contact glass when focus and magnification m are adjusted to contact glass X1; object-side distance from position to adjust magnification of object to lens X2; from position to focus object Object-side distance to lens Y; Image-side distance from lens to imaging point when focusing and magnification m on contact glass Y1; Magnification of object And control means for controlling the arrangement of the lens and the adjusting mirror so as to satisfy the relationship of the image side distance from the lens to the image forming point when the magnification m is adjusted to the position where is adjusted. .