JP3678058B2 - Light source device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a light source device used mainly for scanning a film image.
[0002]
[Prior art]
In general, in a scanner equipped with this type of light source device, a lamp housing and a negative mask are provided on the fuselage, and the lamp housing and the negative mask are connected by a mirror tunnel. Thus, the film set on the negative mask is irradiated and the light illuminating the negative film is detected by a CCD (Charge-Coupled Device).
[0003]
By the way, in the above apparatus, the density differs depending on the type of film to be read. Specifically, the density of the negative film is higher than that of the positive film. Therefore, for example, when the light amount of the light source is set according to the negative film, when the film to be scanned is a positive film, there is a problem that the light from the light source is too strong and the reading by the CCD cannot be performed properly.
[0004]
Therefore, conventionally, for example, using a CCD with a shutter, the amount of light is controlled by the shutter of the CCD, or the amount of light is adjusted by controlling the diaphragm mechanism using an existing diaphragm mechanism provided in the optical path. A method of doing so has been proposed.
[0005]
[Problems to be solved by the invention]
However, a CCD with a shutter is expensive, and when this method is adopted, there is a problem that the manufacturing cost of the apparatus becomes high.
[0006]
On the other hand, when the diaphragm mechanism described above is used as the light quantity adjusting means when switching between the negative film and the positive film, the adjustment amount of the light quantity of each film by the diaphragm mechanism is reduced. It is very difficult to absorb the filter and CCD over time and variations, in other words, there is a problem that the dynamic range becomes narrow.
[0007]
The present invention was developed in view of the above circumstances, and the object is to adjust the amount of light from the light source appropriately according to the type of film without narrowing the dynamic range, and The object is to provide a light source device capable of protecting a film from a light source.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the invention described in claim 1 is directed to a light source device in which a negative film or a positive film is irradiated with light from a light source, and at least the kind of film between the light source and the film. A rotating plate having a light amount adjustment filter for adjusting the light amount corresponding to the light adjusting unit for rotating the rotating plate, and a light shielding plate for blocking the light from the light source to prevent the film from burning. A light-shielding device that interposes the light-shielding plate in the optical path of the light source and changes the position to a position that blocks light from the light source and a position that is separated from the optical path. The control changes the position of the light amount adjustment filter to a position intervening in the light path of the light source and a position away from the light path, and the light shielding device is interposed in the light path of the light source by driving the light shielding device. It was so as to reposition the location and spaced apart and positioned to block the light of the light source from the optical path by.
[0009]
According to a second aspect of the present invention, in the light source device according to the first aspect of the present invention, the light amount adjusting filter is constituted by a filter corresponding to a positive film and a filter corresponding to a setup operation.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 schematically shows a photographic processing apparatus equipped with a light source device A and a scanner unit B according to the present invention. The light source device A is attached to and detached from a lamp housing 1 and the lamp housing 1. A condenser lens unit 2, a light source 3, a heat ray reflection filter 4, a dimming unit 5, first and second fly-eye lenses 6 a and 6 b for making light uniform, a cold A mirror 7 is provided.
[0011]
The heat ray reflective filter 4, the first fly-eye lens 6 a, the dimming unit 5, the second fly-eye lens 6 b, the cold mirror 7, and the condenser lens unit 2 are provided with a negative mask 70 at a predetermined position outside the light source 3 and the light source device A. Is interposed on the optical axis connecting the negative film F conveyed through the film.
[0012]
The light source 3 includes a halogen lamp 31, a heat sink 32, and a reflector 33.
[0013]
The heat ray reflective filter 4 has a function of reflecting visible light while reflecting infrared light, and specifically reflects light having a wavelength of 780 nm or more and transmits light having a wavelength of less than 780 nm. The filter with the function to make it used is used.
[0014]
The dimming unit 5 includes a support frame 51, a rotating plate 52 rotatably supported on one side of the supporting frame, and a DC motor 53 for rotating the rotating plate 52. A circular through hole 51a is formed at a position corresponding to the optical axis 31 and a circular first, second, and third opening 52a is formed in the rotary plate 52 in a region radially divided into three from the rotation center.・ 52b and 52c are established.
[0015]
A positive light amount adjustment filter 54 for adjusting the light amount corresponding to the positive film F is attached to the first opening 52a, a setup operation light amount adjustment filter 55 is attached to the second opening 52b, and the motor 53 By rotating the rotating plate 52 by a predetermined angle by the drive control, the light emitted from the halogen lamp 31 is transmitted through one of the two types of filters 54 and 55 and the third opening 52c. Yes.
[0016]
In the embodiment shown in the figure, a neutral density filter (hereinafter referred to as ND filter) that cuts 68% of incident light with a transmittance of 32% is used as the positive light quantity adjustment filter 54, and a setup light quantity adjustment filter. 55, an ND filter that cuts 84% of the total amount of incident light with a transmittance of 16% is used.
[0017]
The above ND filter uses the thing excellent in heat resistance formed by knead | mixing a filter component in the glass which is a base material.
[0018]
The setup work in which the above-described setup work light quantity adjustment filter 55 is used means that, for example, when magenta, yellow, and cyan components that are complementary colors of blue, red, and green are replaced when the halogen lamp 31 is replaced. The work etc. which adjust light quantity are shown.
[0019]
Further, as shown in FIG. 4, the first slit 56 a and the second slit 56 b are opened at 120 degrees apart in the circumferential direction, and are opposed to the outer peripheral edge of the rotary plate 52 in the support frame 51, as shown in FIG. 4. The first sensor 57a and the second sensor 57b made of photo interrupters are provided at 120 degrees apart from each other in the circumferential direction, and the filters 54 and 55 are detected by the detection of the slits 56a and 56b by the sensors 57a and 57b. In addition, the rotating plate 52 is stopped at a position where any one of the third opening 52c faces the through hole 51a of the support frame 51.
[0020]
That is, in the embodiment shown in the figure, when the third opening 52c is opposed to the through hole 51a, both the slits 56a and 56b of the rotating plate 52 come to the sensing positions of both the sensors 57a and 57b, and both the sensors 57a and 57b When the drive of the motor 53 is stopped when the 57b is turned on, and when the positive light amount adjustment filter 54 is opposed to the through hole 51a, the second slit 56b of the rotary plate 52 is moved by the second sensor 57b. When the sensing position is reached and only the second both sensors 57b are turned on, the driving of the motor 53 is stopped, and when the setup light quantity adjustment filter 55 is opposed to the through hole 51a, the rotating plate When the first slit 56a of 52 comes to the sensing position of the first sensor 57a and only the first sensor 57a is turned on, the motor 53 And so as to stop the motion.
[0021]
Further, in the embodiment shown in the drawing, in order to reliably stop the rotating plate 52 at a position where the filters 54 and 55 and the third opening 52c face the through hole 51a, as shown in FIG. The regulating body 58 having the recesses 58a provided at equal intervals in the circumferential direction is fixed to the rotation center of the rotating plate 52, and the intermediate portion in the longitudinal direction of the link 58b is freely oscillated via the pivot 58c. A roller 58d that can be fitted into the recess 58a is supported at one end in the length direction of the link 58b so as to freely rotate, and between the other end in the length direction of the link 58b and the support frame 51. Further, a coil spring 58e for swinging and urging the link 58b in a direction in which the roller 58d is fitted in the recess 58a is stretched.
[0022]
Further, the light control unit 5 is provided with a light shielding device 8 for preventing the film F from being burned by the light of the halogen lamp 31.
[0023]
As shown in FIG. 5, the light-shielding device 8 includes a light-shielding plate 81 and a drive device 82 for swinging the light-shielding plate 81. The drive device 82 is rotated in the forward direction by energizing a solenoid. A rotating shaft 83 that rotates and a spiral spring 84 that biases the rotating shaft 83 in the reverse direction are provided.
[0024]
Then, one end in the length direction of the light shielding plate 81 is fixed to the shaft end of the rotating shaft 83, and when the solenoid of the driving device is in a non-energized state, the rotating shaft 83 is reversed by the spring force of the spiral spring 84. (The counterclockwise direction in FIG. 5), the other end in the length direction of the light shielding plate 81 is located at a position facing the through hole 51a of the support frame 41 as shown by a solid line in FIG. As shown in FIG. 5, the other end in the length direction of the light-shielding plate 81 is indicated by a two-dot chain line in the forward direction against the spiral spring 84 (clockwise in FIG. 5). The support frame 41 is spaced from the through hole 51a.
[0025]
In the figure, reference numeral 85 denotes a pin for regulating the swing range of the light shielding plate 81.
[0026]
Further, in the embodiment shown in the figure, the width of the other end in the length direction of the light shielding plate 81 is made smaller than the diameter of the through hole 51a, and the other end in the length direction of the light shielding plate 81 is opposed to the through hole 51a. The light from the halogen lamp 31 partially leaks to the film F side from the peripheral portion of the through hole 51a, and the film F set on the negative mask 70 is illuminated with the leaked light. The stop position of F can be confirmed.
[0027]
The first and second fly's eye lenses 6a and 6b are colorless and transparent having a structure in which a transparent substrate and a number of microlenses are integrally formed. The first fly's eye lens 6a and the heat ray reflective filter 4 are adjusted. The second fly-eye lens 6 b is disposed between the light control unit 5 and the cold mirror 7.
[0028]
Thus, as described above, by arranging the two first and second fly-eye lenses 6a and 6b continuously in the optical axis direction, the unevenness in the amount of light emitted from the halogen lamp 31 is reliably removed. I can do it.
[0029]
The surface of the first fly-eye lens 6a and the second fly-eye lens 6b may have a structure in which a heat ray reflective coating is deposited. In such a structure, the heat rays reach the film F. Furthermore, the temperature rise on the film surface can be further suppressed.
[0030]
The cold mirror 7 transmits infrared rays and reflects only visible light toward the film F. In this embodiment, a mirror that reflects only visible light having a wavelength of 400 to 780 nm is used. ing. Therefore, the light emitted from the halogen lamp 31 is removed by the heat ray reflection filter 4 and the cold mirror 7, and the temperature rise of the film F is suppressed.
[0031]
An antireflection plate 71 is disposed 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 71 on the cold mirror 7 side is Honed and black anodized. Thereby, the infrared rays transmitted through the cold mirror 7 are prevented from being reflected in the film F direction.
[0032]
The lamp housing 1 is formed with an opening portion through which light passes from the cold mirror 7 to the negative film F, and the condenser lens unit 2 is detachably installed outside the opening portion.
[0033]
The condenser lens unit 2 includes a lens holder 21, a reflection plate 22, a condenser lens 23, and a diffusion plate 24.
[0034]
On the other hand, the scanner unit B includes a housing 9 in which first and second lenses 91 and 92, a rotary mirror 93 interposed between the first lens 91 and the second lens 92, and a second lens 92 are disposed. And a first to third CCD (Charge Coupled Device) 95, 96, and 97 for converting the three lights dispersed by the prism 94 into electric signals.
[0035]
In the figure, reference numeral 98 denotes a shutter provided between the second lens 92 and the prism 94.
[0036]
Thus, the light from the light source 3 that has passed through the film F is introduced into the scanner unit B, passes through the first lens 91, is reflected by the rotating mirror 93, passes through the second lens 92, and passes through the prism 94. The light incident on the prism 94 is divided into three lights having the same characteristics in the prism 94, and the first CCD 95 that converts the blue component into an electrical signal, and the red component as an electrical signal. The light is incident on the second CCD 96 for conversion and the third CCD 97 for converting the green component into an electric signal. The CCDs 95, 96, and 97 generate electrical signals corresponding to the amounts of blue, red, and green components, respectively.
[0037]
Next, the operation of the above photo processing apparatus will be described.
[0038]
The light emitted from the halogen lamp 31 enters the heat ray reflection filter 4, a part of the heat ray is removed by the heat ray reflection filter 4, and visible light is transmitted.
[0039]
The light emitted from the heat ray reflective filter 4 is incident on the first fly-eye lens 6a, and after the unevenness of the light amount is removed, the light amount unevenness is further transmitted by passing through the light control unit 5 and the second fly-eye lens 6b. After being removed and reflected in the negative film F direction by the cold mirror 7, the light reflected by the cold mirror 7 enters the condenser lens unit 2 and passes through the condenser lens 23 and the diffusion plate 24. The film F set on the negative mask 70 is irradiated.
[0040]
The light from the light source 3 that has passed through the film F is introduced into the scanner unit B, passes through the first lens 91, is reflected by the rotating mirror 93, and enters the prism 94 through the second lens 92. The light incident on the prism 94 is divided into three light beams having the same characteristics in the prism 94, and is incident on the first CCD 95, the second CCD 96, and the third CCD 97. The CCDs 95, 96, In 97, an electrical signal corresponding to the amount of light of the blue component, red component, and green component is generated.
[0041]
When the negative film is set on the negative mask 70 and scanning of the negative film is performed in the above processing operations, the motor 53 is driven to drive both sensors 57a as the negative film scanning mode is selected by the operator. -Until the 57b is turned on, in other words, the rotating plate 52 rotates until the third opening 52c comes to the position corresponding to the through hole 51a, and the third opening 52c comes to the position corresponding to the through hole 51a. When the sensors 57a and 57b are turned on, the rotation of the rotating plate 52 is stopped. At this time, the roller 58d is elastically fitted into the recess 58a, and the stop position of the rotating plate 52 is not shifted.
[0042]
When a positive film is set on the negative mask 70 and the positive film is scanned, both sensors 57a and 57b are turned on by driving the motor 53 as the positive film scanning mode is selected by the operator. In other words, in other words, the rotating plate 52 rotates until the positive light amount adjustment filter 54 of the first opening 52a comes to a position corresponding to the through hole 51a, and when the second sensor 57b is turned on, the rotating plate 52 rotates. At this time, the roller 58d is elastically fitted into the recess 58a so that the stop position of the rotating plate 52 is not shifted, and the light from the halogen lamp 31 is not scanned when the positive film F is scanned. The first to third CCDs are cut by a predetermined amount (68% in the embodiment) by the positive light amount adjustment filter 54. By 5-86-87 than it is adjusted to the light amount suitable for the scanning of the positive film F.
[0043]
On the other hand, when the setup operation is performed, as the setup mode is selected by the operator, until the first sensor 57a is turned on by driving the motor 53, in other words, the setup light quantity of the second opening 52b. The rotating plate 52 rotates until the adjustment filter 55 comes to a position corresponding to the through hole 51a. When the first sensor 57a is turned on, the rotation of the rotating plate 52 is stopped. At this time, the roller 58d is depressed 58a. The stop position of the rotating plate 52 is not shifted and the light of the halogen lamp 31 is cut by a predetermined amount (84% in the embodiment) by the setup light quantity adjustment filter 55 during the setup operation. Thus, the light amount is adjusted to be suitable for the setup work.
[0044]
Thus, in the above embodiment, not only the negative film but also the positive film can be efficiently scanned and set up, and the negative film and the positive film can be scanned at the same level. The deterioration of the halogen lamp and the variations in the quality of the CCD and the filter are absorbed by, for example, the gain value (multiplied value of the reading value) of the CCD.
[0045]
【The invention's effect】
According to the first aspect of the present invention, in the light source device that irradiates the negative film or the positive film with the light from the light source, the light quantity is adjusted between the light source and the film at least according to the type of the film. A dimming unit that includes a rotating plate having a light amount adjustment filter for rotating the rotating plate, and a shading plate that blocks light from the light source to prevent the film from burning. There is provided a light-shielding device for changing the position between a position where the light from the light source is shielded by being interposed in the optical path and a position where the light is separated from the light path, and the light amount adjustment filter is controlled by the rotation control of the rotating plate by the light control unit. The position of the light source is changed to a position intervening in the optical path and a position away from the optical path, and a position where the light shielding plate is interposed in the optical path of the light source by driving the light shielding device. By which is adapted to reposition to the position spaced from the in Kihikariro, by the rotation control of the rotating plate by dimmer unit, for example when scanning positive film not only negative films, without narrowing the dynamic range, from the light source In addition to being able to adjust the amount of light appropriately, the position of the light amount adjustment filter can be changed easily and efficiently, and the position of the light shielding plate can be changed to a position where it is interposed in the light path of the light source by driving the light shielding device. It is possible to reliably prevent the film from being burned with light from the light source.
[0046]
According to a second aspect of the present invention, in the light source device according to the first aspect, the light amount adjusting filter includes a filter corresponding to a positive film and a filter corresponding to a setup operation. In addition to the effect of the present invention, the light quantity from the light source can be appropriately adjusted also in the setup work.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a scanner equipped with a light source device according to the present invention.
FIG. 2 is a schematic side view showing an embodiment of a light source device according to the present invention.
FIG. 3 is a schematic plan view showing an embodiment of a light source device according to the present invention.
FIG. 4 is an explanatory diagram showing a schematic configuration of the dimming unit.
FIG. 5 is an explanatory diagram showing a schematic configuration of the light shielding device.
[Explanation of symbols]
F Film 3 Light source 53 Rotating plate 54 Positive light amount adjustment filter 55 Setup light amount adjustment filter 81 Light shielding plate

Claims (2)

In the light source device that irradiates the negative film or the positive film with the light from the light source,
Between the light source and the film, there is provided a rotating plate having a light amount adjustment filter for adjusting the light amount corresponding to at least the type of film, a light control unit for rotating the rotating plate, and light from the light source A light-shielding plate that shields and prevents the film from burning, and a light-shielding device that interposes the light-shielding plate in the light path of the light source and changes the position to a position that blocks light from the light source and a position that is separated from the light path. The light amount adjusting filter is provided to be changed between a position interposed in the light path of the light source and a position away from the light path by rotation control of the rotating plate by the light control unit, and the light shielding plate is driven by driving the light shielding device. The light source device is characterized in that the position of the light source is changed to a position where the light of the light source is blocked by being interposed in the light path of the light source and a position separated from the light path.   The light source device according to claim 1, wherein the light amount adjustment filter includes a filter corresponding to a positive film and a filter corresponding to a setup operation.

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