JPH10246920A - Exposure device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely control light emitted from a light source with filtered by providing at least one place between the plural filters with a specified partition means. SOLUTION: The partition means 70 is fitted to between a yellow filter part 40 and a magenta filter part so that four sides thereof can be detached from a housing and made of a plate material provided with a square window 70a having width W2 and height H2. he window 70a is formed only at a part opposed to the filters 45c and 45f on a condition that the filter 4c and 45f enter the optical path of irradiation light the most and constituted so as to be provided with such size that the effective area of the filters 45c and 45f almost coincide with the area of the window 70a in viewing on an optical axis X. By fitting the partition means 70 constituted in such a way, the irradiation light transmitted without being controlled by the filters 45c and 45f because it is reflected on the housing and the other parts of an exposure device can be reduced when it is controlled by utilizing the filters 45c and 45f. Thus, the light is more precisely controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exposure apparatus having a plurality of filters for dimming light emitted from a light source.

[0002]

2. Description of the Related Art For example, when printing an image from a film on a photosensitive material such as photographic paper or the like, by appropriately adjusting the light of blue, green, and red by a filter according to the color of the film, and exposing the light, There have been exposure apparatuses capable of obtaining prints of good colors. In such an apparatus, yellow, magenta, and cyan filters are made to enter the optical path from a light source such as a halogen lamp, and the irradiation light is controlled by the degree to which these filters block the irradiation light from the light source.

[0003]

In the above apparatus, the light emitted from the light source passes through some of the yellow, magenta, and cyan filters, is dimmed, enters the mirror tunnel, and is diffused and mixed. However, not all of the irradiation light from the light source passes along the optical path where the filter is present, but also enters around the filter, and some light repeatedly enters the mirror tunnel through reflection and the like. Therefore, there is room for improvement in the accuracy of control of the irradiation light using a filter.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an exposure apparatus capable of accurately adjusting light from a light source by a filter. In order to achieve this object, partitioning means is provided at at least one position between the plurality of filters according to the present invention, and the partitioning means is a specific filter adjacent to the light source side of the plurality of filters on the light source side. Is arranged so as to block at least a part of the irradiation light that does not pass through the specific filter in a state where the dimming effect is the maximum, and the partitioning unit passes through the specific filter and the partitioning unit. A window is formed at a position where at least a part of the irradiation light reaching the light source passes therethrough.

[0005] By providing such partitioning means,
When dimming using a specific filter is desired, it is possible to reduce the amount of illumination light that passes through without being dimmed by this specific filter, for example, by being reflected by the housing or other parts of the exposure apparatus, etc. Dimming can be performed. Therefore, for example, when the exposure apparatus according to the present invention is used for printing, a print color can be obtained as desired, and printing costs can be reduced by reducing printing failures.

In the embodiment of the present invention, by providing the partitioning means between each of the plurality of filters, for example, when three types of filters are provided, it is possible to provide the partitioning means for each of the filters. In comparison with the case where the partitioning means is provided at two places, it is possible to reduce the light that does not pass through the filter even though it is desired to control the light by the filter, and to perform more accurate light control of the irradiation light.

In an embodiment of the present invention, the filter is of a type that adjusts the irradiation light by adjusting an amount of the irradiation light entering the optical path, and the filter most enters the light path of the irradiation light. In the state where, in the optical axis view of the irradiation light, by arranging the window at a position facing the specific filter, the dimmed part of the irradiation light allows the light to pass through this window, A structure capable of effectively blocking the light that passes through around and repeats reflection and the like can be obtained effectively, and more accurate dimming of the irradiation light becomes possible.

Further, in the embodiment of the present invention, it is possible to make the area of the window smaller than the effective area of the specific filter in the optical axis view of the irradiation light, thereby further improving the blocking effect. It is possible. Other features and advantages of the present invention will become apparent from the following description of embodiments of the present invention with reference to the drawings.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration diagram of a photographic printing apparatus provided with an exposure apparatus as an application example of the exposure apparatus according to the present invention. As shown in FIG. 1, the photographic printing apparatus includes:
An image information reading section 1 for reading an image of a film F such as a negative film for each frame, an exposure device 2 for projecting and exposing the image of the film F onto a photographic paper P, a developing processing section 3 for developing the exposed photographic paper P, and And a controller CO for controlling the operation of the entire photographic printing apparatus. Controller CO
A console O for inputting various control information, and a monitor MT for displaying image information and the like read by the image information reading unit 1
Is connected. Further, a film transport roller R1 for transporting the film F, a motor M1 for rotating and driving the film transport roller R1, a photographic paper transport roller R2 for transporting the photographic paper P, and a motor M2 for rotating and driving the photographic paper transport roller R2. Is provided.

The motor M1 conveys the film F from the image information reading section 1 to the exposure device 2 in a frame-feed state under the control of the controller CO. The image information reading section 1 reads the image information of the film F for each frame. The controller CO obtains an exposure condition for each frame based on the image information read by the image information reading unit 1, and obtains an image which will be obtained when the photographic paper P is projected and exposed by the obtained exposure condition. Is simulated and displayed on the monitor MT. The motor M2 pulls out the photographic paper P from the photographic paper magazine 4 under the control of the controller CO, and transports the photographic paper P from the exposure device 2 to the development processing unit 3 in a frame-feeding state. The exposure device 2 projects and exposes the image of the frame of the film F located at the exposure processing position onto the photographic paper P according to the exposure conditions obtained by the controller CO.

The operator of the photographic printing apparatus operates the monitor MT.
When an appropriate image is not obtained by looking at the image displayed in the section (2), the operator can correct the exposure condition from the console O. The photographic paper P after the exposure is processed by the developing unit 3
, And cut and discharged one by one corresponding to each frame of the film F. The image information reading unit 1 includes a reading light source 10 that illuminates the film F, and a reading mirror tunnel 1 that eliminates spatial brightness unevenness of the reading light source 10 and makes the reading light source 10 uniform.
1, and an image sensor unit 12 which incorporates a CCD image sensor and a zoom lens, and reads image information by separating the transmitted light of the film F into three primary colors, is provided on the same optical axis.

The exposure apparatus 2 includes an exposure light source 20, a light control filter 21 for adjusting the color balance of light applied to the film F, and an exposure mirror tunnel 22 for uniformly mixing light passing through the light control filter 21. Are provided adjacent to each other. A printing zoom lens 23 and a shutter 24 for forming image information of the film F on the photographic paper P are provided on the same optical axis as the exposure device 2.

Next, the exposure apparatus 2 will be described with reference to FIGS. In FIG. 2, the exposure light source 20 which is a halogen lamp, the yellow filter unit 40 as a first filter unit of the dimming filter 21, and the second
A magenta filter section 50 as a filter, a cyan filter section 60 as a third filter, a housing 31 for accommodating these filter sections, a mirror tunnel 22 and the like are shown.

Since the structure of each filter section of the dimming filter 21 is the same, the yellow filter section 40 will be described as an example with reference to FIG. The member 45 has a yellow filter 45c attached to a window 45b formed in the first filter frame 45a.
A yellow filter 45f is attached to a window 45e formed in the second filter frame 45d. First
The filter frame 45a is fixed to the belt 34 via a mounting portion 48, and the second filter frame 45d is
4 is fixed via an attachment portion 49. The belt 34 is driven by a motor unit 41. The motor section 41 includes a stepping motor 41a, a motor shaft 41b, and a belt mounting section 41c for driving the belt 34. The belt 43 includes the motor section 41 and the tension section 4.
Extending between the two.

When the stepping motor 41a rotates counterclockwise in FIG. 3, the first filter frame 45a and the second filter frame 45d move in a direction away from the optical axis X, and when rotated clockwise, the first filter frame 45a and the second filter frame 45d move. 45a and the second filter frame 45d move in the direction of the optical axis X. That is, when the stepping motor 41a rotates counterclockwise in FIG. 3, the first filter frame 45a and the second filter frame 45d move in directions away from each other, and when rotated clockwise, the first filter frame 45a and the second The filter frame 45d moves in a direction approaching each other. These filters 4
The movement of 5c and 45f is performed symmetrically with respect to the optical axis X,
The distance between the filter 45c and the optical axis X is set to be always the same as the distance between the filter 45f and the optical axis X. The filter frames of the first and second filter frames 45a and 45d and the other filter portions 50 and 60 are made of aluminum, but may be made of resin.

The driving of the stepping motor 41a, that is, the movement of the first and second filter frames 45a and 45d is strictly controlled by the controller CO. The movement of the first and second filter frames 45a and 45d causes
The degree of dimming is controlled by the ratio of c and 45f entering the set optical path OP of the irradiation light from the light source 20. This entry rate can be controlled between 0% and 100%. In addition, the first and second filter frames 45a, 45
When 5d enters the optical path OP most, the two filters 45c and 45f overlap in the optical axis X direction. The effective area of the filters 45c and 45f means the filters 45c and 45f when the pair of filters 45c and 45f do not overlap in the optical axis X view.
f is the sum of the areas of each of these filters 45c,
If 45f overlap, these filters 45c,
45f is a value obtained by subtracting the area of the overlapping portion from the sum of the respective areas of 45f.

In FIG. 3, reference numeral 33 denotes a space fixed in the axial direction X for guiding the first and second filter frames 45a and 45d in a direction perpendicular to the axis X. A pair of guide grooves 33a, 33 provided
b is a filter guiding means having b. As shown in FIG. 2, a member 55 corresponding to a magenta filter section 50 as a second filter, a motor section 51, a tension section 52
The member 65, the motor unit 61, the tension unit 62, and the like are also provided in the cyan filter unit 60 as the third filter.

As shown in FIGS. 2 and 4, the housing 31 completely surrounds and accommodates the filter portions 40, 50 and 60. The halogen lamp 20 as a light source is mounted on a wall 31a provided inside the housing. An entrance window 31 having a width W1 and a height H1 is provided on the wall 31b.
c is provided, and an infrared cut filter 32 is attached so as to completely cover the window 31c.

An exit window 31d having a width W3 and a height H3 of the housing 31 between the filter sections 40, 50, 60 and the mirror tunnel 22 is provided with a dustproof glass 37 so as to completely cover the exit window 31d. A diffusion plate 38 for diffusing light emitted from a light source is provided in a portion of the mirror tunnel 22 adjacent to the dust-proof glass 37. Entrance window 31
The width W1 and the height H1 of c may be set to be the same as the width W3 and the height H3 of the exit window 31d, or may be set to be different. In the present specification, an optical path which advances linearly from the light source 20 and through which irradiation light emitted from the exit window 31d passes is referred to as a setting optical path OP.

In FIGS. 2 and 3, partitioning means 70 and 80 according to the invention are provided. These partitioning means 70
Are the yellow filter unit 40 and the magenta filter unit 50
A rectangular window 70 having a width W2 and a height H2 removably attached to the housing 31 at four sides thereof.
It is a plate member provided with a. The window 70a of the partitioning means
In the present embodiment, the filter 45c, 45f is formed only in a portion facing the filter 45c, 45f in a state where the filter 45c, 45f enters the optical path OP of the irradiation light most. Has an effective area substantially equal to the area of the window 70a.

The partitioning means 80 includes a magenta filter section 50.
And a partitioning means 8 disposed between the
The zero window 80a has the same size as the window 70a and is formed at an overlapping position when viewed in the optical axis direction. Partitioning means 7
0 and 80 may be made of metal such as iron or aluminum,
Also, it may be made of resin. By providing such partitioning means 70 and 80, the light does not proceed linearly from the light source but is reflected by the side wall of the housing 31 and the like, and the filters 45c and
For example, the irradiation light that does not pass through 5f or the like and is indicated by 90 in FIG. 2 can be blocked, and the light control can be performed more accurately.

[Alternative Embodiment] In the above embodiment, the windows 70a, 80a of the partitioning means 70, 80 are formed in a square shape, but these shapes may be, for example, elliptical or circular. Also, windows 70a, 80a of the partitioning means 70, 80
Means that the filters 45c and 45f are connected to the optical path O
In the state where the filter 45c has entered the most, the filters 45c, 4c
5f, the filter 45c, 45f and the window 70a are configured to have a size substantially matching when viewed in the optical axis X. However, the area of the window 70a is reduced by the effective size of the filters 45c, 45f. 20% of area
In the case where the size of the window 70a is larger than that of the filter 45c, the area of the window 70a can be increased.
It may be smaller than the effective area of 45f.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a photographic printing apparatus including an exposure apparatus according to the present invention.

FIG. 2 is a schematic configuration diagram of an exposure apparatus according to the present invention.

FIG. 3 is a perspective view of a main part of the exposure apparatus according to the present invention.

FIG. 4 is a longitudinal sectional side view of a main part of the exposure apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Image information reading part 2 Exposure apparatus 3 Development processing part 20 Light source 40 Yellow filter part 50 Magenta filter part 60 Cyan filter part 70 Partition means 80 Partition means

Claims (4)

[Claims] 1. An exposure apparatus comprising a plurality of filters for dimming irradiation light from a light source, wherein at least one portion between the plurality of filters is provided with a partitioning means, wherein the partitioning means comprises a plurality of filters. Of, the specific filter adjacent to the light source side from the partitioning means is arranged to block at least a part of the irradiation light that does not pass through the specific filter in a state where the dimming effect is the maximum, An exposure apparatus, wherein the partitioning means forms a window at a position where the partitioning means passes at least a part of the irradiation light reaching the partitioning means. 2. An exposure apparatus according to claim 1, wherein said partitioning means is provided between each of said plurality of filters. 3. The filter adjusts the irradiation light by adjusting an amount of the irradiation light entering the optical path. In a state where the filter enters the optical path of the irradiation light most, the filter adjusts the irradiation light. The exposure apparatus according to claim 1, wherein the window is disposed at a position facing the specific filter when viewed along an optical axis. 4. The exposure apparatus according to claim 3, wherein an area of the window is smaller than an effective area of the specific filter.