JP2000258856A - Light source device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize the loss of the quantity of light emitted from a light source and to irradiate an object to be illuminated with the light which is not varied in quantity. SOLUTION: This light source device is constituted so that a 1st and a 2nd fry-eye lenses 6A and 6B for eliminating the variance of the light quantity and a condenser lens 18 for condensing the light in a necessary area are arranged on an optical path leading to a negative film 8 being as the object to be illuminated. Besides, the light incident side of the lens 18 is provided with a reflection plate 17 which is arranged so as to surround the peripheral part of a light area and whose reflection surface is formed at the inside thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source device provided in a photographic processing device such as a photographic processing device or a photographic printer, for irradiating a negative film with light from a light source when performing scanning or printing. It is.

[0002]

2. Description of the Related Art Various light source devices have been proposed for irradiating a negative film with light from a light source when scanning a photographic film or printing a photosensitive material such as photographic printing paper. As a light source in such a light source device, a halogen lamp is generally used.

[0003] Light emitted from a halogen lamp has uneven light intensity due to the influence of the shape of the filament, the reflector and the like. On the other hand, in the case of a negative film, it is necessary to uniformly irradiate the entire area where an image is recorded. Therefore, in the above-mentioned light source device, a configuration for equalizing the light from the halogen lamp between the halogen lamp and the negative film is required.

FIG. 2 is a schematic view showing an example of a configuration of a conventional scanning light source device having a mirror tunnel 33 as a configuration for equalizing light from a halogen lamp. This light source device comprises a light source 31 and an ND filter 32.
And a mirror tunnel 33.

The light source 31 includes a halogen lamp and a reflector, and a part of the light emitted from the halogen lamp is reflected by the reflector, so that the light is emitted in a substantially constant direction (the direction of the light control filter 32). Is done. The ND filter 32 has a function of appropriately cutting the amount of incident light.

[0006] The mirror tunnel 33 is composed of a cylindrical portion having a light reflecting surface formed on the inner peripheral surface, and diffusion plates provided on the light incident side and the light emitting side of the cylindrical portion.
The diffusion plate is made of, for example, ground glass or PMMA (Poly-methy
l methacrylate (methacrylic resin) and a resin containing milky white pigment.

The operation at the time of light emission in the conventional light source device having such a configuration is as follows. The amount of light emitted from the light source 31 is adjusted by passing through the ND filter 32, and the light is diffused by the diffusion plate on the light incident side of the mirror tunnel 33 and enters the mirror tunnel 33. Then, the entered light is reflected and diffused by the light reflecting surface inside the mirror tunnel 33, is again diffused by the diffusion plate on the light exit side of the mirror tunnel 33, and then reaches the negative film 34.

As described above, the light emitted from the light source 31 is once transmitted through the mirror tunnel 33,
By irradiating the negative film 4, it is possible to irradiate the negative film 34 with uniform light without unevenness.

[0009]

SUMMARY OF THE INVENTION Mirror tunnel 33
As described above, the uneven light quantity is made uniform by irregularly reflecting the incident light inside as described above. That is, the amount of light attenuated due to repeated reflection,
The incident light is also reflected in the incident direction due to the irregular reflection, resulting in a loss of light amount and the like.

The mirror tunnel 33 is provided with a diffusion plate on both the incident side and the exit side. Since this diffusion plate is made of ground glass or milky white material as described above, the amount of light greatly decreases when the light from the light source passes through the two diffusion plates.

The light source device having the above configuration is used for scanning, and light illuminating the negative film is detected by a CCD (Charge-Coupled Device). The CCD can obtain a high-contrast image when the amount of light of the received image is widely distributed between the upper limit and the lower limit of the light amount sensor. That is, the light illuminating the negative film needs to have a certain amount of light.

Therefore, in the configuration of the conventional photographic processing apparatus, in order to compensate for a decrease in the amount of light caused by light from the light source passing through the mirror tunnel 33, the power of the halogen lamp is increased to cope with the problem. . As a result, there have been problems such as an increase in power consumption of the halogen lamp and an increase in cost of the halogen lamp itself.

As described above, when the power of the halogen lamp is increased, the amount of heat emitted from the halogen lamp also increases. In this case, it is necessary to increase the cooling capacity of the configuration for cooling the inside of the light source device, for example, the configuration of a fan or the like, which leads to further increase in power consumption.

In addition, when the power of the halogen lamp is increased, the illuminance unevenness in the negative film is increased. In the above case, the thickness of the diffusion plate of the mirror tunnel 33 is increased, and the diffusion effect in the mirror tunnel 33 is enhanced. A method is conceivable. However, an increase in the thickness of the diffusion plate causes a further decrease in the amount of light, which requires a light source with a higher capacity.

As another method for preventing the light amount unevenness on the negative film, a method of forming the mirror tunnel 33 long in the optical axis direction and increasing the number of reflections inside the mirror tunnel 33 to enhance the diffusion effect is also available. is there. However, in this method, the mirror tunnel 33 becomes large,
Accordingly, there is a problem that the light source device itself becomes larger.

In the case of a configuration in which an image on a negative film is read as image data by a CCD, the light amount difference between the central portion and the peripheral portion of the image is measured by using only a diffusion plate without using the mirror tunnel 33. There is also a configuration in which correction is performed by processing. More specifically, the brightness of the entire image is averaged by performing data processing on the data in the peripheral portion where the light amount is smaller than that in the central portion so as to increase the brightness.

However, when such data processing is performed, there arises a problem that unnecessary noise is emphasized and an image that needs to be clearly expressed becomes unclear.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to minimize the loss of light amount of light emitted from a light source and to apply light having no light amount unevenness to an illumination target. An object of the present invention is to provide a light source device that can perform irradiation.

[0019]

According to a first aspect of the present invention, there is provided a light source device comprising: a light source; a light uniforming unit configured to equalize light emitted from the light source; A condensing means for condensing the light uniformized by the means on the illumination target; and And a reflecting means formed on the inside thereof.

According to the above arrangement, since the reflecting means disposed so as to surround the periphery of the light area is provided in the area between the light uniforming means and the condensing means, the light uniforming means is provided. Of the light emitted from the light source, the light diffused to the peripheral portion is reflected toward the center by the reflection means. That is, it is possible to increase the ratio of the light incident on the light condensing means to the light emitted from the light homogenizing means. Therefore, the light emitted from the light source can be efficiently applied to the illumination target.

Further, the light uniformized by the light homogenizing means is condensed by the light condensing means and illuminated on the object to be illuminated, so that it is possible to irradiate only the area requiring illumination. Therefore, unlike the conventional case where the light diffused by the diffusion plate is radiated to the illumination target, the light is not diffused to unnecessary regions, so that the illumination target can be efficiently illuminated.

Further, since the light emitted from the light source is condensed by the light condensing means after the light quantity unevenness is removed by the light uniforming means, the light quantity unevenness of the light irradiated on the illumination object is efficiently removed. Can be. More specifically, for example, in a configuration in which the light emitted from the light source is condensed by the light condensing means and then incident on the light uniformizing means, the light that is condensed and the cross-sectional area of the light beam is reduced is light uniformized. Will be incident on the means. In this case, light passes through only a part of the light homogenizing means, and the light is homogenized, so that the efficiency of homogenization deteriorates. On the other hand, according to the above configuration, the light emitted from the light source is incident on almost the entire surface of the light homogenizing means, and thereafter is condensed by the light condensing means, so that the light can be efficiently uniformized. .

According to a second aspect of the present invention, in the light source device according to the first aspect, the light emitted from the light source can be reflected so as to irradiate the light in the direction in which the light collecting means is arranged. The light source further includes a reflector provided in a concave shape around the light source, and among the light incident on the area surrounded by the reflecting means, the light incident on the vicinity of the peripheral portion is reflected by the reflecting means and then incident on the condensing means. In addition, the curvature of the reflection surface of the reflector is set so that the light incident near the center directly enters the light collecting means.

According to the above arrangement, of the light incident on the area surrounded by the reflecting means, the light incident on the peripheral part is reflected by the reflecting means, then is incident on the condensing means, and is incident on the central part. Since the incident light is directly incident on the condensing means, in the light area on the illumination target, the light that is directly reflected without being reflected by the reflecting means, The light reflected and radiated by the means is irradiated in a superimposed manner. Therefore, the difference in the amount of light between the central part and the peripheral part in the light area on the illumination target can be reduced, so that the illumination target can be irradiated with uniform light.

According to a third aspect of the present invention, in the light source device according to the first or second aspect, the light uniforming means is a fly-eye lens having a plurality of microlenses formed on a surface of a transparent substrate. And

According to the above configuration, the fly-eye lens is used as the light uniforming means. Since this fly-eye lens is composed of a transparent transparent substrate and microlenses, a transmittance of 90% or more is realized. Thus, the degree of dimming of the light emitted from the light source can be reduced. Therefore, by using the light equalizing means having such a configuration, it is possible to uniformly diffuse the incident light and to minimize the decrease in the amount of light.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.

As shown in FIG. 1, the light source device according to this embodiment has a housing 1 as a lamp box and a detachable condenser lens unit 2. Inside the housing 1, a light source 3, a heat ray reflection filter 4, a rotating plate ASSY
5. First and second fly-eye lenses (light uniformizing means)
6A and 6B and a cold mirror 7 are provided. Heat ray reflection filter 4, first fly-eye lens 6A,
The rotating plate ASSY5, the second fly-eye lens 6B, the cold mirror 7, and the condenser lens unit 2 are provided on the optical axis connecting the light source unit 3 and the negative film 8 conveyed to a predetermined position outside the light source device. 3 are provided in this order along the emission direction of the light.

The light source device according to the present embodiment is used as a light source device for irradiating the negative film 8 with light and detecting the original image recorded on the negative film 8 by the CCD. The present invention can also be applied to a light source device for printing on photographic paper as a photosensitive material.

The light source unit 3 includes a halogen lamp (light source) 9
, A heat sink 10 and a reflector 11.

As the halogen lamp 9, it is preferable to use a halogen lamp having a structure in which one filament serving as a light emitting portion is provided, and its longitudinal direction is parallel to the light emitting direction. This is because the halogen lamp 9 having such a structure emits light closest to an ideal point light source when viewed from the direction of the negative film 8,
This is because unevenness in the amount of light on the negative film 8 can be minimized. However, the present invention is not limited to the halogen lamp 9 having such a configuration. For example, the halogen lamp 9 includes one filament serving as a light emitting unit, and its longitudinal direction is perpendicular to the light emission direction. It is also possible to use one having two filaments, the longitudinal direction of each filament being parallel to the light emission direction.

The heat sink 10 supplies power to the halogen lamp 9 and functions both as a socket for fixing the halogen lamp 9 at a predetermined position and as a heat sink for absorbing and releasing heat generated by the halogen lamp 9. have.

The reflector 11 has a concave shape around the halogen lamp 9 so that the light emitted from the halogen lamp 9 can be reflected and radiated forward (toward the heat ray reflection filter 4) and collected. Is provided. The curvature of the reflection surface of the reflector 11 is designed such that the theoretical focus of the reflected light is located in a region between the second fly-eye lens 6B and the condenser lens unit 2 described later.

The reflector 11 is made of a metal material such as aluminum, and has a plurality of fins for heat radiation on the outer surface opposite to the light reflecting surface. Therefore, the reflector 11 has an excellent function of absorbing and emitting the heat generated by the halogen lamp 9.

The material constituting the reflector 11 is not limited to the above-mentioned one. For example, a structure in which a dichroic mirror formed of a glass member and having a function of reflecting visible light on a reflection surface is formed. It is also possible to use However, when the reflector 11 made of a glass material is compared with the reflector 11 made of a metal material as in the present embodiment, the reflector 11 made of a metal material has more stable reflection characteristics. And it is inexpensive and has a long life.

The reflector 11 and the heat sink 10
Is directly fixed by screwing or sandwiching by spring steel, so that the relationship between the light emitting position of the filament in the halogen lamp 9 and the curvature of the concave surface of the reflector 11 can be set with high accuracy. Also, at the time of assembling or replacing, it is possible to easily determine a delicate arrangement relationship between the halogen lamp 9 and the reflector 11. Further, since the heat absorbed by the heat sink 10 can easily move to the reflector 11 having a high heat radiation effect, the halogen lamp 9
Can be cooled more efficiently.

It is also possible to adopt a configuration in which a heat ray absorbing film having a function of absorbing infrared rays is deposited on the reflecting surface of the reflector 11, and in this case, the infrared component of the light reflected by the reflector 11 is reduced. be able to.

The heat ray reflection filter 4 has a function of reflecting infrared rays and transmitting visible rays. Here, light having a wavelength of 780 nm or more is reflected, and 780 n
A heat ray reflection filter 4 having a function of transmitting light having a wavelength of less than m is used.

The rotating plate ASSY5 is a disc-shaped frame 1
2, a positive filter, a setup filter, and an opening are provided in a region radially divided into three from the center.

A stepping motor is provided so as to be in contact with the outer periphery of the frame 12, and the frame 12 can be rotated by driving the stepping motor. Thus, the frame 12
Is rotated, the light emitted from the halogen lamp 9 is transmitted through one of the two types of filters and the opening.

The positive filter has a function of cutting incident light by 68%. Further, the setup filter has a function of cutting the total light amount of the incident light by 84%. This setup filter is used when the halogen lamp 9 is replaced.

In the present embodiment, since the light is applied to the negative film 8, when the light is normally applied, the opening is positioned on the optical path of the light emitted from the halogen lamp 9. The frame 12 is arranged so that

The rotating plate ASSY 5 is provided with a solenoid 13 for preventing negative burn and a shutter 14. Negative burn prevention solenoid 13 and shutter 14
Is configured such that the shutter 14 is inserted into the optical path from the halogen lamp 9 by driving the negative burn prevention solenoid 13 except when the exposure of the negative film 8 is actually performed. . This is because the negative film 8 does not move from the exposure position due to a device failure or the like, and the halogen film 9
This is intended to prevent the occurrence of discoloration and the like due to the continuous irradiation of light from the negative film 8 due to the temperature rise of the negative film 8.

First and second fly-eye lenses 6A and 6
B has a structure in which a transparent substrate and a large number of microlenses are integrally formed, and does not contain a milky white pigment or the like, and is colorless and transparent. The microlenses are all formed in the same shape, and are two-dimensionally and regularly arranged on the surface of the transparent substrate in consideration of the focal point of each microlens. At this time, each micro lens in the first fly-eye lens 6A is arranged so as to guide the incident light into the area of the second fly-eye lens 6B, and each micro lens in the second fly-eye lens 6B controls the incident light. It is arranged so as to be guided into the opening area of the condenser lens unit 2.

The light incident on the first and second fly-eye lenses 6A and 6B having such a configuration is refracted and diffused on the surface having the uneven shape. It can be said that light incident on 6A and 6B is split by a large number of microlenses. Therefore, the first and second fly-eye lenses 6
A.6B has a function equivalent to a surface light source due to the action of the microlens. Since the first and second fly-eye lenses 6A and 6B are both composed of a transparent transparent substrate and a micro lens, the transmittance is 9%.
0% or more is realized, and the degree of dimming of light emitted from the light source is suppressed to a low level. As described above, the first and second fly-eye lenses 6A and 6B can uniformly diffuse the incident light and minimize the decrease in the amount of light.

The first fly-eye lens 6A having the above configuration is disposed between the heat ray reflection filter 4 and the rotating plate ASSY5, and the second fly-eye lens 6B is disposed between the rotating plate ASSY5 and the cold mirror 7A. And is located between. In this way, by arranging the two first and second fly-eye lenses 6A and 6B continuously in the optical axis direction, it is possible to reliably remove unevenness in the light amount of the light emitted from the halogen lamp 9. it can.

The first and second fly-eye lenses 6
It is also possible to adopt a configuration in which a heat ray reflective coating is deposited on the surface of A.6B. In such a configuration, the arrival of heat rays to the negative film 8 is further suppressed, and the temperature rise on the negative surface is reduced. It can be further suppressed.

The cold mirror 7 transmits infrared rays while reflecting only visible rays in the direction of the negative film 8. In the present embodiment, 400 to 780n
A cold mirror 7 that reflects only visible light having a wavelength of m is used. Such a cold mirror 7 has a higher efficiency of removing infrared rays than the heat ray reflection filter 4, for example. Thus, the halogen lamp 9
The light emitted from the infrared ray component is removed by the heat ray reflection filter 4 and the cold mirror 7, so that the temperature rise of the negative film 8 can be sufficiently suppressed.

An anti-reflection plate 15 is arranged on the back side of the cold mirror 7, that is, on the side opposite to the reflection surface of the cold mirror 7. The surface of the antireflection plate 15 on the side of the cold mirror 7 is subjected to a honing treatment, and further to a black alumite (anodic oxide film) treatment. This prevents the infrared light transmitted through the cold mirror 7 from being reflected toward the negative film 8. The anti-reflection plate 15 also has a function of preventing infrared rays transmitted through the cold mirror 7 from reaching the housing 1 and causing a temperature of a part of the housing 1 that may be touched by a user to rise extremely. ing.

The housing 1 has an opening through which light from the cold mirror 7 to the negative film 8 passes, and the condenser lens unit 2 is detachably installed outside the opening. Have been. In addition, on both side surfaces in a space surrounded by the second fly-eye lens 6B, the cold mirror 7, and the above-described opening, a reflection plate is provided to reflect light diffused in the side direction to the inside. This increases the light use efficiency.

The condenser lens unit 2 includes a lens holder 16, a reflection plate (reflection means) 17, a condenser lens (condensing means) 18, and a diffusion plate 19. The upper surface of the condenser lens unit 2 is in a state where the condenser lens unit 2 is attached to the housing 1 (hereinafter, referred to as “condenser lens unit 2”).
(Referred to as an attached state), it is disposed so as to be in close contact with the opening in the housing 1.

The condenser lens unit 2 has a handle portion 20 provided at a position protruding outside the side surface of the housing 1 in the mounted state, and the user grips the handle portion 20. Thus, the condenser lens unit 2 is attached and detached.

The lens holder 16 has a cylindrical shape, and its cross section has a substantially square shape. Also,
The lens holder 16 is arranged such that the center axis thereof substantially coincides with the optical axis of light emitted from the cold mirror 7 to the negative film 8 in the mounted state.

A diffusion plate 19 is arranged at the lowermost part of the inner periphery of the lens holder 16, and a condenser lens 18 is arranged above the diffusion plate 19. The inner surface of the lens holder 16 extending from the uppermost part to the upper part of the condenser lens 18 is provided with a reflection plate 17.
Is provided.

The condenser lens 18 is formed in a substantially square shape along the inner peripheral surface of the lens holder 16, and is provided on the inner peripheral side of the lens holder 16 by a lens holder made of spring steel (see FIG. (Not shown).

The diffusion plate 19 is made of ground glass, and is arranged to make minute scratches on the negative film 8 inconspicuous. The dimming rate by the diffusion plate 19 is about 5 to 10%, and the degree of decrease in the amount of light when light passes through the diffusion plate 19 is slight.

The reflection plate 17 is made of, for example, a metal plate or a mirror whose surface is mirror-finished by sputtering or the like, and is formed in a cylindrical area extending from the light incident side of the condenser lens unit 2 to the condenser lens 18. It is provided so as to cover the entire peripheral surface.

The left and right ends of the condenser lens unit 2 as viewed from the handle 20 are guided by guides (not shown) formed in the housing 1. The condenser lens unit 2 can be moved back and forth (left and right in FIG. 1) according to the guide portion when viewed from the handle portion 20 side. Thereby, the condenser lens unit 2 is detachable from the housing 1.

Further, the lens holder 1 in the housing 1
A magnet 21 is provided at a position facing the magnet 6, and in a mounted state, the magnet 21 and the lens holder 16 are bonded by magnetic force. That is,
The condenser lens unit 2 is detachable from the housing 1 by moving to the left and right in FIG. 1. In the mounted state, the magnet 21 and the lens holder 16 are fixed by being adhered by magnetic force. . Therefore, the user needs the condenser lens unit 2
Can be easily replaced, and accurate positioning in the mounted state can be performed.

In the present embodiment, the condenser lens unit 2 is detachable from the housing 1 by the above-described structure. However, the present invention is not limited to such a structure. Any configuration may be used as long as the configuration allows easy attachment and detachment of the condenser lens unit 2 and accurate positioning of the condenser lens unit 2 in the mounted state.

As described above, the condenser lens unit 2
Is detachable, so that a plurality of condenser lens units 2 each having a condenser lens 18 having a different focal length are prepared, and the condenser lens units 2 are exchanged according to the size of the negative film 8. Can be used. Therefore, even if the size of the negative film 8 is changed, by exchanging the condenser lens unit 2, the area irradiated with light becomes smaller than the image area on the negative film 8, or conversely, the illumination area becomes smaller. A large amount of light does not irradiate an area other than the area where the light is required. Therefore, even when the negative films 8 having different sizes are used, it is possible to efficiently irradiate the light emitted from the halogen lamp 9 to the illumination required area.

Next, the path of the light emitted from the halogen lamp 9 in the light source device will be described.

The light emitted at a solid angle of 360 ° from the halogen lamp 9 is reflected forward by the reflector 11 and enters the heat ray reflection filter 4. In the heat ray reflection filter 4, a part of the heat ray is removed and visible light is transmitted.

The light emitted from the heat ray reflection filter 4 is
After the light enters the first fly-eye lens 6A and the light amount unevenness is removed, the light passes through any region of the frame 12 on the rotating plate ASSY5. Thereafter, the light passes through the second fly-eye lens 6 </ b> B to further remove the unevenness in the light amount, and is reflected by the cold mirror 7 in the direction of the negative film 8. In addition, a part of the infrared light that has reached the cold mirror 7 passes through the cold mirror 7 and deviates from the optical path.

The light reflected by the cold mirror 7 enters the condenser lens unit 2. Of the light that has entered the condenser lens unit 2, the light that has entered the vicinity of the peripheral portion is reflected by the reflector 17 and enters the condenser lens 18. Also, the light incident near the center is
The light directly enters the condenser lens 18. Then, the light transmitted through the condenser lens 18 transmits through the diffusion plate 19,
The negative film 8 is irradiated.

As described above, the condenser lens unit 2
Out of the light incident on the peripheral portion, the light incident on the peripheral portion is reflected by the reflection plate 17 and then incident on the condenser lens 18.
The light that has entered the vicinity of the center directly enters the condenser lens 18, so that the light amount difference between the periphery and the center can be substantially eliminated in the light area irradiated on the negative film 8. This is because, in the light area on the negative film 8, in the peripheral area where the light amount is small,
It is presumed that the light irradiated directly without being reflected by the reflection plate 17 and the light reflected and irradiated by the reflection plate 17 are superimposed and irradiated.

As described above, the condenser lens unit 2
Out of the light incident on the peripheral portion, the light incident on the peripheral portion is reflected by the reflection plate 17 and then incident on the condenser lens 18.
In order for the light incident near the center to directly enter the condenser lens 18, the curvature of the reflection surface of the reflector 11 needs to be set so that the light travels as described above. In the configuration of the present embodiment, as described above, the curvature of the reflecting surface of the reflector 11 is set such that the theoretical focus of the reflected light is within the area between the second fly-eye lens 6B and the condenser lens unit 2 described later. , The difference in the amount of light between the central portion and the peripheral portion of the light region on the negative film 8 can be minimized.

On the other hand, for example, when the theoretical focal point of the light reflected by the reflector 11 is moved to the light source side from the above position, the incident angle of the light entering the condenser lens unit 2 is sharp. That is, light is irregularly reflected by the reflection plate 17. In this case, there is a problem that the loss of the light amount increases.

When the theoretical focal point of the light reflected by the reflector 11 is moved to the condenser lens 18 side from the above-mentioned position, the incident angle of the light entering the condenser lens unit 2 is reduced, and the reflection angle is reduced. The amount of light reflected on the plate 17 and irradiated onto the negative film 8 is reduced. In this case, the effect of increasing the amount of light in the peripheral portion on the negative film 8 due to the reflection plate 17 is reduced, and the difference in light amount between the central portion and the peripheral portion cannot be reduced.

As described above, the configuration in which the reflector 17 is provided on the light source side with respect to the condenser lens 18 makes it possible to almost eliminate the light quantity difference between the central portion and the peripheral portion of the light area on the negative film 8. Becomes possible. Specifically, the difference in light amount between the central portion and the peripheral portion can be made within about 3%. For example, when the configuration is such that the reflection plate 17 is not provided, the light amount difference between the central portion and the peripheral portion is about 10%. That is, by providing the reflection plate 17 as described above, it is possible to reduce the light amount difference by about 7%.

For example, the light transmitted through the negative film 8 is
In the case of a device that detects using a CD, when the reflection plate 17 is not provided as described above, the data detected by the CCD is subjected to data processing to compensate for the light amount difference between the central portion and the peripheral portion. I needed to. However, as described above, when such data processing is performed, extra noise is included in the image data.

On the other hand, according to the configuration of the present embodiment,
As described above, the difference in light amount between the central portion and the peripheral portion can be kept within 3%. Therefore, it is not necessary to perform image processing for compensating the light amount difference, so that the processing can be simplified and good image data can be provided.

In the case where the reflection plate 17 is not provided, since the difference in light amount between the central portion and the peripheral portion is about 10%, the image of the negative film 8 is printed on photographic paper as a photosensitive material. It could not be applied to the device.
However, according to the configuration of the present embodiment, the difference in light amount between the central portion and the peripheral portion can be almost eliminated, so that the present invention can be applied to an apparatus for exposing photographic paper.

As described above, the first and second fly-eye lenses each having a plurality of microlenses formed on the surface of the transparent substrate so that the incident light can be guided into the incident side region of the condenser lens unit 2. Lens 6A ・ 6B
The first and second fly-eye lenses 6
Most of the light from which the light amount unevenness has been removed by A · 6B enters the condenser lens unit 2. Therefore, like a diffusion plate using a resin containing a ground glass or a milky white pigment, as conventionally used,
Since light is not diffused to unnecessary regions, loss of light amount of light emitted from the halogen lamp 9 can be significantly reduced.

The first and second fly-eye lenses 6
The light uniformed by A.6B is condensed by the condenser lens 18 and irradiated on the negative film 8, so that the light can be irradiated only on the area requiring illumination. Therefore, unlike the conventional case where the light diffused by the diffusion plate is irradiated on the illumination target, the light is not diffused to unnecessary regions, and the negative film 8 can be efficiently illuminated. it can.

[0076]

As described above, in the light source device according to the first aspect of the present invention, the light source, the light equalizing means for equalizing the light emitted from the light source, and the light equalizing means are made uniform by the light equalizing means. A light-collecting means for condensing light on an illumination target, and arranged so as to surround a peripheral portion of a light region irradiated from the light-uniformizing means to the light-collecting means, and a reflection surface is formed inside thereof. And a reflecting means.

As a result, of the light emitted from the light homogenizing means, the light diffused to the peripheral part is reflected toward the central part by the reflecting means. That is, it is possible to increase the ratio of the light incident on the light condensing unit to the light outgoing from the light uniformizing unit, so that it is possible to efficiently irradiate the light emitted from the light source to the illumination target. .

Further, the light uniformized by the light homogenizing means is condensed by the light condensing means and illuminated on the object to be illuminated, so that it is possible to irradiate only the area requiring illumination. Therefore, unlike the conventional case where the light diffused by the diffuser is applied to the illumination target, the light is not diffused to unnecessary regions, and the illumination target can be efficiently illuminated. To play.

Further, the light emitted from the light source is condensed by the light condensing means after the light quantity unevenness is removed by the light homogenizing means, so that the light emitted from the light source is incident on almost the entire surface of the light uniforming means. Then, the light is condensed by the light condensing means. Therefore, there is an effect that unevenness in the amount of light applied to the illumination target can be efficiently removed.

The light source device according to the second aspect of the present invention has a concave surface around the light source so that the light emitted from the light source can be reflected and irradiated in the direction in which the light condensing means is disposed. It further comprises a reflector provided in a shape,
Of the light incident on the area surrounded by the reflection means, the light incident on the periphery is reflected by the reflection means and then incident on the light condensing means, and the light incident on the vicinity of the central part is directly transmitted to the light condensing means. In this configuration, the curvature of the reflection surface of the reflector is set so as to be incident.

Thus, in addition to the effect of the first aspect, in the light area on the illumination target, light that is directly radiated without being reflected by the reflection means to the peripheral portion where the amount of light is small, The light reflected and reflected by the reflection means is irradiated in a superimposed manner. Therefore, the difference in the amount of light between the central part and the peripheral part in the light area on the illumination target can be reduced, so that the illumination target can be irradiated with uniform light.

A light source device according to a third aspect of the present invention is configured such that the light uniforming means is a fly-eye lens having a plurality of microlenses formed on a surface of a transparent substrate.

Thus, in addition to the effects of the first and second aspects, the fly-eye lens is used as the light uniforming means, and this fly-eye lens is composed of a transparent substrate and a micro lens. Therefore, a transmittance of 90% or more is realized, and the degree of dimming of the light emitted from the light source can be suppressed low. Therefore, by using the light equalizing means having such a configuration, there is an effect that the incident light can be diffused uniformly and the decrease in the amount of light can be minimized.

[Brief description of the drawings]

FIG. 1 is a side view showing a schematic configuration of a light source device according to an embodiment of the present invention.

FIG. 2 is a side view showing a schematic configuration of a conventional light source device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Housing 2 Condenser lens unit 3 Light source part 4 Heat ray reflection filter 5 Rotating plate ASSY 6A / 6B 1st and 2nd fly-eye lens (light equalization means) 7 Cold mirror 8 Negative film 9 Halogen lamp (light source) 10 Heat sink 11 Reflector 16 Lens Holder 17 Reflector (Reflector) 18 Condenser Lens (Condenser) 19 Diffuser

Claims (3)

[Claims] A light source; a light equalizing unit configured to equalize light emitted from the light source; a light collecting unit configured to collect the light uniformed by the light uniformizing unit on an illumination target; A light source device, comprising: a reflection unit disposed so as to surround a periphery of a light region irradiated from the light uniformization unit to the light collection unit, and a reflection surface formed inside the light region. A reflector provided in a concave shape around the light source so as to reflect light emitted from the light source and irradiate the light in a direction in which the light collecting means is arranged; Of the light incident on the area surrounded by the reflection means, the light incident on the periphery is reflected by the reflection means and then incident on the light condensing means, and the light incident on the vicinity of the central part is directly transmitted to the light condensing means. 2. The light source device according to claim 1, wherein a curvature of a reflecting surface of the reflector is set so as to be incident. 3. The light source device according to claim 1, wherein said light uniformizing means is a fly-eye lens having a plurality of microlenses formed on a surface of a transparent substrate.