JPH11287907A - Light selecting filter and light source unit equipped with same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the light selecting filter which has two functions, i.e., a function for removing heat rays and a function for converging incident light and hardly cause breakage owing to heat accumulation and shock at the time of assembly and portage. SOLUTION: On one surface of a condenser lens having a function for converging incident light, a heat-ray reflecting film 4 is vapordeposited which transmits light of wavelength below visible rays and reflects infrared rays. The condenser lens 3 is so arranged that the surface of the condenser lens 3 where the heat-ray reflecting film 4 is vapor-deposited faces a halogen lamp 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to light for transmitting, absorbing, or reflecting light rays from a light source used for scanning a photographic film or printing a photosensitive material, for example, according to wavelength. The present invention relates to a selection filter and a light source device including the same.

[0002]

2. Description of the Related Art Conventionally, a halogen lamp has been widely used as a light source for scanning a photographic film or printing a photosensitive material such as photographic printing paper. The halogen lamp emits visible light necessary for printing or scanning, as well as infrared light unnecessary for printing or scanning, when emitting light. The infrared rays cause a rise in the temperature of various optical components, negative films, and photosensitive materials such as photographic printing paper in the optical path.

[0003] In order to prevent the above-mentioned temperature rise of each optical component, negative film, photosensitive material and the like due to infrared rays, a heat ray reflection filter is provided between a halogen lamp and a condenser lens for condensing light from the halogen lamp. A configuration for disposing is conventionally used.

FIG. 4 is a schematic diagram showing the arrangement of a conventional light source unit 31, a heat ray reflection filter 32, and a condenser lens 33. The light source unit 31, the heat ray reflection filter 32, and the condenser lens 33 are arranged so that the light emitted from the light source unit 31 passes through the heat ray reflection filter 32 and the condenser lens 33 in this order.

The light source unit 31 includes a halogen lamp 34, a reflector 35 for reflecting light emitted from the halogen lamp 34 in a substantially constant direction, a socket 36 for supplying power to the halogen lamp 34, a halogen lamp 34, and a reflector 35. , And a light source support 37 for supporting the socket 36 at a predetermined position. The reflector 3
Reference numeral 5 also has a heat sink function for absorbing and radiating heat from the halogen lamp 34.

The heat ray reflection filter 32 is obtained by depositing a heat ray reflection film 39 on a filter glass plate 38.
The heat ray reflective film 39 has a function of transmitting visible light and reflecting infrared light. Thereby, the heat ray reflective film 39
Since the light transmitted through the light beam hardly contains an infrared component, it is possible to suppress an increase in the temperature of the optical components after the heat ray reflective film 39 and the photosensitive material.

The condenser lens 33 has a shape of a convex lens and has a function of condensing light emitted from the light source unit 31. Thus, the light emitted from the light source unit 31 is collected and sent to a region where subsequent printing is performed.

[0008]

In the arrangement shown in FIG. 4, the heat ray reflection filter 32 is arranged near the light source unit 31. In this case, since the temperature of the halogen lamp 34 becomes considerably high, heat near the light source unit 31 also causes heat to be accumulated in the heat ray reflection filter 32.

The filter glass plate 38 in the heat ray reflection filter 32 is designed to have a thickness of about 3 to 4 mm. This is to reduce the material cost by reducing the thickness as much as possible, and to reduce the loss of visible light when the visible light passes through the filter glass plate 38, the thickness as described above. Is set.

As described above, the filter glass plate 38 of the heat ray reflection filter 32 has a relatively small thickness. Therefore, when heat is accumulated in the heat ray reflection filter 32 as described above, the heat ray reflection filter 32 may be broken.

Incidentally, the temperature of the tube wall of the halogen lamp 34 rises to about 750.degree. Therefore, even if heat-resistant glass such as Pyrex (registered trademark) is used as the filter glass plate 38, such heat-resistant glass has a heat-resistant temperature of about 450 ° C., and the heat-ray reflection filter 32 is damaged by heat accumulation. Can happen.

Further, since the heat ray reflection filter 32 has a relatively small thickness as described above, there is a possibility that the heat ray reflection filter 32 may be damaged if the operation is not carefully performed when the heat ray reflection filter 32 is attached. There is also. Furthermore, if an impact is applied to the apparatus provided with the heat ray reflection filter 32 during transportation or use, the heat ray reflection filter 32 may be damaged by the impact.

Further, in the above configuration, since the two components of the heat ray reflection filter 32 and the condenser lens 33 are components made of a glass member, there is a problem that assembly and mounting are complicated. To elaborate,
In order to fix the glass component in place,
Fixing with screws or the like cannot normally be performed, and it is necessary to fix via a spring plate or a rubber material. Therefore, it is necessary to perform the above-described fixing for each of the two components made of the glass member, and such a configuration causes an increase in the number of components and a complicated assembly process.

Further, since the heat ray reflection filter 32 and the condenser lens 33 need to be arranged so as to be exactly perpendicular to the optical axis, there is a problem that it is necessary to accurately position each of them. .

It is an object of the present invention to provide a function for removing heat rays,
Provided is a light selection filter which has two functions, that is, a function of condensing incident light, and is less likely to be damaged due to heat accumulation or damage due to an impact during assembly or transport, and a light source device including the same. Is to do.

[0016]

According to a first aspect of the present invention, there is provided a light selection filter, comprising: an optical member having a function of condensing incident light; A heat ray reflective film having a function of transmitting and reflecting infrared rays, wherein the heat ray reflective film is formed on a light incident side surface of the optical member.

Conventionally, as means having a function of transmitting light having a wavelength of visible light or less and reflecting infrared light, a heat ray reflection filter in which a heat ray reflection film is deposited on a thin glass plate has been generally used. . However, according to the above configuration, since the heat ray reflective film is formed on the optical member having the function of condensing the incident light, one optical component has two heat ray reflection functions and a light condensing function. It is possible to have functions. Therefore, conventionally, two configurations, that is, a configuration having a heat ray reflection function and a configuration having a light condensing function were required. However, the present invention can provide a single configuration. Can be planned.

Further, the conventional heat ray reflection filter and the optical member having the function of condensing light are usually made of a glass material, and the structure for fixing such a part at a predetermined position and the mounting process are complicated. Had become. However, according to the above configuration, the number of components made of a glass material can be reduced, so that a complicated configuration for fixing as described above can be reduced. Therefore, the configuration of the device and the manufacturing process can be simplified.

Further, since the conventional heat ray reflection filter is made of a thin glass plate, there is a possibility that the heat ray reflection filter may be damaged at the time of assembling. Can be eliminated, so that the manufacturing process can be simplified and the yield can be improved.

Since the heat ray reflective film is formed on the light incident side surface of the optical member, even if the incident light contains infrared light, the infrared ray is reflected by the heat ray reflective film, and No infrared light enters the optical member. Therefore, heat accumulation in the optical member due to infrared rays can be suppressed, and damage to the optical member due to a rise in temperature can be prevented.

According to a second aspect of the present invention, in the light selection filter according to the first aspect, the optical member is a condenser lens.

According to the above arrangement, the optical member is a condenser lens, and since the condenser lens is usually a relatively thick part, it is less likely to be damaged by heat. In addition, since the strength is increased, damage during assembly and damage due to impact during use or transportation are unlikely to occur. Therefore, it is possible to provide an optical selection filter with few failures and a good yield.

According to a third aspect of the invention, there is provided a light source device, a light source, an optical member having a function of condensing light from the light source, and a heat ray reflection having a function of transmitting light having a wavelength equal to or shorter than visible light and reflecting infrared light. A light-adjusting filter for adjusting the hue of light from the light source; the heat ray reflective film is formed on a light incident side surface of the optical member; It is characterized by being arranged between the optical filter and the optical filter.

According to the above configuration, since the optical member is disposed between the light source and the dimming filter, the light whose infrared component is almost completely removed by the heat ray reflective film formed on the optical member is modulated. The light will enter the optical filter.
Therefore, since the temperature rise of the light control filter is suppressed, deterioration of the light control performance of the light control filter due to the temperature rise can be prevented. Therefore, it is possible to provide a light source device that can always emit light having an optimal hue.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] The following will describe one embodiment of the present invention with reference to FIG.

FIG. 1 is a schematic diagram showing an outline of the arrangement of a light selection filter 1 and a light source unit 2 according to an embodiment of the present invention. The light source unit 2 and the light selection filter 1 are arranged so that the light emitted from the light source unit 2 passes through the light selection filter 1.

The light selection filter 1 includes a condenser lens 3
And a heat ray reflection film 4. The condenser lens 3 has one surface flat and the other surface convex, and the heat ray reflective film 4 is deposited on the flat surface of the condenser lens 3. The heat ray reflective film 4 has a function of transmitting light having a wavelength equal to or less than visible light and reflecting infrared light. In addition, the condenser lens 3 has a function of condensing light emitted from the light source unit 2.

Then, the heat ray reflection film 4 is formed so that the flat surface of the condenser lens 3 on which the heat ray reflection film 4 is deposited faces the light source unit 2, in other words, the heat ray reflection film 4 is formed on the condenser lens 3.
The light selection filter 1 is disposed so as to be disposed on the light incident surface side of the light-emitting device. In addition, the optical axis of the light emitted from the light source unit 2 does not change before and after passing through the light selection filter 1 so that the optical axis passes through the center of the condenser lens 3, and Condenser lens 3
The light selection filter 1 is arranged so that the direction of the normal to the plane side of the optical axis is parallel to the direction of the optical axis.

The light source section 2 includes a halogen lamp 5 as a light source, a reflector 6, a socket 7, and a light source support section 8. The reflector 6 has a concave surface that has been subjected to mirror finishing, and reflects light from the halogen lamp 5 in a substantially constant direction (the direction in which the light selection filter 1 is disposed) by the concave surface. The reflector 6 also has a function of a heat sink that absorbs and dissipates heat from the halogen lamp 5. The socket 7 supplies power to the halogen lamp 5 and supports the halogen lamp 5 at a predetermined position. The light source support 8 supports the halogen lamp 5, the reflector 6, and the socket 7 at predetermined positions.

Here, the path followed by the light emitted from the halogen lamp 5 will be described below.

A part of the light emitted from the halogen lamp 5 is reflected by the reflector 6 and enters the heat ray reflection film 4 of the light selection filter 1. Of the light incident on the heat ray reflection film 4, the light of the infrared component is reflected on the surface of the heat ray reflection film 4, and light having a wavelength equal to or shorter than visible light passes through the heat ray reflection film 4 and enters the condenser lens 3.

The light incident on the condenser lens 3 is condensed and converted as parallel light or convergent light.
Is emitted. The light emitted from the condenser lens 3 passes through various optical systems (not shown) and reaches a photosensitive material such as photographic printing paper via a negative film.

As described above, the infrared ray component of the light emitted from the halogen lamp 5 is reflected by the heat ray reflective film 4, and only the light having a wavelength equal to or shorter than the visible light passes through the condenser lens 3 and the optical system thereafter. Therefore, the light of the infrared component hardly irradiates the photosensitive material. Thereby, the temperature rise of the negative film or the photosensitive material can be suppressed.

As described above, the light selection filter 1 in the present embodiment has a configuration in which the heat ray reflection film 4 is deposited on the light incident surface side of the condenser lens 3. Therefore, even if heat from the halogen lamp 5 is accumulated to some extent in the condenser lens 3, the light selection filter 1
Damage is less likely to occur. This is a condenser lens 3
This is due to the fact that the thickness of the heat ray reflection filter 32 is much larger than that of the filter glass plate 38 shown in the prior art.

Conventionally, the heat ray reflection filter 32 had to be disposed between the light source section 31 and the condenser lens 33. Therefore, in order to make the apparatus as small as possible, the heat ray reflection filter 32 was replaced with the light source section 31. Had to be arranged very close to. Therefore, the temperature rise in the heat ray reflection filter 32 due to the heat from the light source unit 31 becomes large, and the heat ray damage easily occurs.

Further, the temperature of the heat ray reflection film 39 also rises due to the temperature rise of the heat ray reflection filter 32, and depending on the type of the heat ray reflection film 39, there is a problem that the heat ray reflection characteristic is deteriorated.

However, as in the present embodiment, the heat ray reflection film 4 is deposited on the condenser lens 3 to constitute the light selection filter 1. There is no need to dispose it close to the part 2. Therefore, heat accumulation in the light selection filter 1 is relatively small, and a rise in the temperature of the condenser lens 3 can be suppressed, so that damage to the light selection filter 1 due to heat can be further reduced. Also, since the temperature rise of the heat ray reflection film 4 can be suppressed,
It is possible to maintain good heat ray reflection characteristics of the heat ray reflection film 4.

The conventional heat ray reflection filter 32 is relatively thin, having a thickness of 3 to 4 mm. When such a heat ray reflection filter 32 is mounted at a predetermined position, the work is not carefully performed. Then, the heat ray reflection filter 32 may be damaged. Further, even after the heat ray reflection filter 32 is attached, the heat ray reflection filter 32 may be damaged by impact or the like, and it is necessary to carefully move the apparatus.

However, in this embodiment, since the light selection filter 1 is constituted by the condenser lens 3 having a relatively large thickness, the light selection filter 1 is relatively strong in strength. Therefore, when the light selection filter 1 is attached,
The possibility that the light selection filter 1 is damaged when the apparatus is moved can be greatly reduced.

In general, a structure for fixing a glass member at a predetermined position is relatively complicated. This is when fixing the member made of glass,
This is because, for example, a configuration such as fixing via a spring plate or the like or fixing via a rubber material or the like is required.
For example, a configuration in which a glass member is fixed by screwing or the like transmits an external impact directly to the glass member, and thus cannot be used normally. Further, the operation of attaching the member made of glass to the above-described configuration for fixing the member made of glass also becomes complicated.

Therefore, for example, in the conventional configuration, two members, ie, the heat ray reflection filter 32 and the condenser lens 33, are required as members made of glass. A complicated configuration is required for each of the heat ray reflection filter 32 and the condenser lens 33.

On the other hand, in the present embodiment, only the light selection filter 1 is used as a member made of glass, so that a complicated structure for fixing the member made of glass is reduced to half compared with the conventional case. . Therefore, simplification of the apparatus and reduction of material costs can be achieved. Similarly, the complexity of mounting the member made of glass is halved, so that the manufacturing process can be simplified and the manufacturing cost can be reduced.

Embodiment 2 Another embodiment of the present invention will be described below with reference to FIGS. 2 and 3. Note that the same reference numerals are given to components having the same functions as those described in the first embodiment, and the description thereof will be omitted.

FIG. 2 is a schematic diagram showing a schematic configuration of a light source device provided with the light selection filter 1 according to the embodiment of the present invention.

The light source device has a housing 13 as a lamp box. The light source unit 2, the light selection filter 1, the light control unit 9, and the cold mirror 10 are provided in the housing 13. The light selection filter 1, the dimming unit 9, and the cold mirror 10
And negative film 1 conveyed to a predetermined position outside housing 13
2 are provided in this order along the light emission direction of the light from the light source unit 2 on the optical axis connecting the light source 2 and the light source unit 2.

The light source unit 2 includes a halogen lamp 5 as a light source, a reflector 6, and a socket 7. The reflector 6 has a concave surface that has been subjected to mirror finishing, and reflects light from the halogen lamp 5 in a substantially constant direction (the direction in which the light selection filter 1 is disposed) by the concave surface. The socket 7 supplies power to the halogen lamp 5 and supports the halogen lamp 5 at a predetermined position.

The light selection filter 1 includes a condenser lens 3
And a heat ray reflection film 4. The condenser lens 3 has one surface flat and the other surface convex, and the heat ray reflective film 4 is deposited on the flat surface of the condenser lens 3.

Then, the heat ray reflection film 4 is formed so that the flat surface of the condenser lens 3 on which the heat ray reflection film 4 is deposited faces the light source unit 2, in other words, the heat ray reflection film 4 is formed on the condenser lens 3.
The light selection filter 1 is disposed so as to be disposed on the light incident surface side of the light-emitting device. In addition, the optical axis of the light emitted from the light source unit 2 does not change before and after passing through the light selection filter 1 so that the optical axis passes through the center of the condenser lens 3, and Condenser lens 3
The light selection filter 1 is arranged so that the direction of the normal to the plane side of the optical axis is parallel to the direction of the optical axis.

The condenser lens 3 on which the heat ray reflective film 4 is deposited is arranged at a predetermined position in the housing 13 by the light selective filter supporting member 1a.

The light control unit 9 includes Y (yellow), M
(Magenta), C (cyan) dimming filter 9a for each color
It has.

The cold mirror 10 transmits heat rays and reflects only visible light in the direction of the negative film 12.

The housing 13 includes a cold mirror 10.
Opening 14 serving as a light passing portion from the light to negative film 12
Are formed. A dust entry prevention glass 15 having a shape slightly larger than the inner diameter of the opening 14 is provided on the inner surface of the housing 13 so as to cover the opening 14.

Between the housing 13 and the negative film 12, on the optical axis connecting the halogen lamp 5 and the negative film 12, in order to reduce exposure unevenness in the negative film 12, A mirror tunnel 11 for diffusing light and irradiating a negative film 12 is provided.

Next, the path followed by the light emitted from the halogen lamp 5 will be described below.

A part of the light emitted from the halogen lamp 5 is reflected by the reflector 6 and enters the heat ray reflection film 4 of the light selection filter 1. Of the light incident on the heat ray reflection film 4, the light of the infrared component is reflected on the surface of the heat ray reflection film 4, and light having a wavelength equal to or shorter than visible light passes through the heat ray reflection film 4 and enters the condenser lens 3.

The light incident on the condenser lens 3 is collected, exits the condenser lens 3 as convergent light, and enters the light control unit 9.

The light incident on the light control unit 9 is adjusted in the respective color balances of Y, M and C by the light control filter 9a.

The light emitted from the light control unit 9 is reflected by the cold mirror 10 toward the negative film 12. Note that a part of the heat ray that has reached the cold mirror 10 passes through the cold mirror 10 and deviates from the optical path.

The light reflected by the cold mirror 10 passes through the dust intrusion prevention glass 15 and the opening 14 in order and enters the mirror tunnel 11.

After that, the light incident on the mirror tunnel 11 is diffused almost uniformly by the diffuse reflection by the diffusion plate and the mirror on the inner surface of the mirror tunnel 11, and is emitted toward the negative film 12. As a result, uniform light is applied to the negative film 12, and exposure unevenness on the negative surface is reduced as much as possible.

As described above, in the light source device according to the present embodiment, since the light selection filter 1 is disposed between the dimming unit 9 and the light source unit 2, the light selection filter 1 almost eliminates the infrared component. The light thus emitted enters the light control unit 9. Therefore, the temperature rise of the light control filter 9a in the light control unit 9 can be suppressed to a low level, so that the deterioration of the light control performance of the light control filter 9a due to the temperature rise can be prevented.

The light emitted from the halogen lamp 5 has its infrared component removed by two optical components, the light selection filter 1 and the cold mirror 10, and is irradiated on the negative film 12. . Therefore, the ratio of the infrared component in the light applied to the negative film 12 can be made extremely small, so that the temperature rise of the negative film 12 can be kept very small.

Note that the light source device according to the present embodiment is not limited to the configuration described above, and may have the following configuration, for example.

FIG. 3 is a schematic diagram showing a schematic configuration of a light source device as another configuration example. The light source unit 2 in this configuration example includes a halogen lamp 5 and a concave mirror 16. The halogen lamp 5 is arranged so that its longitudinal direction is parallel to a direction perpendicular to the paper surface of FIG. That is, the halogen lamp 5 is arranged so that the longitudinal direction of the halogen lamp 5 is perpendicular to the direction of the optical axis passing through the light selection filter 1 and the light control unit 9.

The concave mirror 16 has a mirror-finished concave portion, and is arranged in the direction opposite to the direction in which the light selection filter 1 is arranged with respect to the halogen lamp 5. The concave portion faces the direction of the halogen lamp 5 and reflects light emitted from the halogen lamp 5 toward the light selection filter 1.

In the above-described configuration, the operation and effects of the light source device described above are similarly exhibited.
A more optimal configuration can be adopted depending on the arrangement relationship of the components inside the unit 3.

[0067]

As described above, the light selection filter according to the first aspect of the present invention has an optical member having a function of condensing incident light, and transmits light having a wavelength of visible light or less and reflects infrared light. A heat ray reflective film having a function of performing the above function, wherein the heat ray reflective film is formed on a light incident side surface of the optical member.

This makes it possible for one optical component to have two functions, a heat ray reflection function and a light collection function. Therefore, conventionally, two configurations of a means having a heat ray reflection function and a means having a light condensing function were required.
According to the present invention, since one configuration can be used, the configuration of the device can be simplified.

Further, since the number of parts made of glass material can be reduced, the complicated structure for fixing as described above can be reduced. Therefore, there is an effect that the configuration of the device and the manufacturing process can be simplified.

Further, since the heat ray reflection filter can be made unnecessary, there is an effect that the manufacturing process can be simplified and the yield can be improved.

In addition, since the accumulation of heat in the optical member due to infrared rays is suppressed, it is possible to prevent the optical member from being damaged due to a rise in temperature.

The light selection filter according to the second aspect of the present invention
The optical member is a condenser lens.

Thus, in addition to the effects of the first aspect, damage due to heat, damage during assembly, and damage due to impact during use or transportation are less likely to occur. Therefore, there is an effect that it is possible to provide an optical selection filter with few failures and a good yield.

A light source device according to a third aspect of the present invention has a light source, an optical member having a function of condensing light from the light source, and a function of transmitting light having a wavelength equal to or shorter than visible light and reflecting infrared light. A heat ray reflective film, and a dimming filter that adjusts a hue of light from the light source; the heat ray reflective film is formed on a light incident side surface of the optical member; and the optical member is a light source. And a dimming filter.

As a result, the temperature rise of the light control filter can be suppressed, so that the deterioration of the light control performance of the light control filter due to the temperature rise can be prevented. Therefore, it is possible to provide a light source device that can always emit light having an optimal hue.

[Brief description of the drawings]

FIG. 1 is a schematic diagram schematically showing the arrangement of a light selection filter and a light source unit according to an embodiment of the present invention.

FIG. 2 is a schematic diagram illustrating a schematic configuration of a light source device including a light selection filter according to another embodiment of the present invention.

FIG. 3 is a schematic diagram showing a schematic configuration in another configuration example of the light source device.

FIG. 4 is a schematic diagram showing an outline of the arrangement of a conventional light selection filter and a light source unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Light selection filter 2 Light source part 3 Condenser lens 4 Heat ray reflective film 5 Halogen lamp 6 Reflector 7 Socket 8 Light source support part 9 Light control unit 9a Light control filter 10 Cold mirror 11 Mirror tunnel 12 Negative film 13 Housing

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Kazuya Tsukamoto 579-1 Umehara, Wakayama-shi, Wakayama Noritsu Koki Co., Ltd.

Claims (3)

[Claims] 1. An optical member having a function of condensing incident light, and a heat ray reflective film having a function of transmitting light having a wavelength equal to or less than visible light and reflecting infrared light, wherein the heat ray reflective film comprises: A light selection filter formed on a light incident side surface of the optical member. 2. The light selection filter according to claim 1, wherein said optical member is a condenser lens. 3. A light source, an optical member having a function of condensing light from the light source, a heat ray reflective film having a function of transmitting light having a wavelength equal to or shorter than visible light and reflecting infrared light, and light from the light source. A light control filter for adjusting the hue of the optical member, wherein the heat ray reflective film is formed on a light incident side surface of the optical member, and the optical member is disposed between the light source and the light control filter. Light source device characterized by being performed.