JP2001083606A - Shading device for photographic printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the fogging of a photosensitive material in a standby state with a simple structure by providing a means for interposing a lens in an optical path only in printing a video picture on the photosensitive material and interposing a shading plate in the optical path excepting the video picture printing time. SOLUTION: A main mirror 11 is installed so as to switch a main optical axis for exposure. And, in printing a film image, the main mirror 11 is retreated to the upper left in figure along a horizontal optical axis so as to expose the surface of the paper 44 with the film image light passing through a film image printing lens. And the video picture printing lens 10 is moved in a direction orthogonal to the optical axis so that it may be interposed in the optical axis S between the mirrors 9 and 11 only in printing the video picture. And the shading plate 13 is interposed in the optical path S excepting the video picture printing time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-shielding device for a photographic printing device, and more particularly to a light-shielding device for a photographic printing device having a function of printing a video image displayed on a CRT onto a photosensitive material through a lens. is there.

[0002]

2. Description of the Related Art A general photographic printing apparatus conventionally used has, for example, a structure schematically shown in FIG. That is, a light source unit 42 for illuminating a frame to be printed set in the negative carrier unit 41 is provided on the upper part of the main body 2 of the photoprinting apparatus 1. Thereby, an image is formed on the photosensitive material (paper) 44. Paper 44
Is pulled out of the roll paper 45 and set at the print position, and the exposed paper 44
After passing through the developing unit 47 to be developed, the drying is performed by the drying unit 48 and then sent to the sorter unit 50. A space 51 exists between the film image printing lens 43 and the paper print position below the film image printing lens 43. In this space 51, an optical unit for performing special printing is detachably mounted. It has become so.

Recently, with the development of digital cameras and the like,
It is possible to selectively print a film image (analog image) recorded on photographic film and a video image (digital image) displayed on a CRT on a photosensitive material, or to synthesize an analog image and a digital image. Demand for color photographic printing apparatuses is increasing.

A photographic printing apparatus for selectively printing an analog image and a digital image displayed on a CRT on a photosensitive material is disclosed in, for example, Japanese Patent Application Laid-Open No. 63-257742. In the photographic printing apparatus disclosed in this publication, an analog image printing lens and a photosensitive material are sequentially arranged below a photographic film, and a CRT having a display screen facing upward is arranged alongside the photosensitive material. A first mirror (submirror) is provided above, and a second mirror is provided above the photosensitive material.
Mirrors (main mirrors) are arranged, and a digital image printing lens is arranged between the mirrors so that the optical axis is horizontal. At the time of digital image printing, an image from a CRT is passed through first and second mirrors to a photosensitive material. Leads to
When an analog image is printed, the first and second mirrors are extracted from the optical path.

[0005]

As described above, a photograph capable of selectively printing a film image as an analog image and a video image displayed on a CRT as a digital image on a photosensitive material as described above. Despite the growing demand for printing equipment, the majority of small labs (labs) currently have photographic printing equipment dedicated to analog image processing, and moreover, analog images and digital Since a photographic printing device that can process both an image and an image is expensive, a digital image printing function should be added by a relatively simple and inexpensive modification to a conventional photographic printing device that has only an analog image printing function. There is a demand for a so-called “digital kit”.

In a digital exposure system for printing a video image displayed on a CRT on a photosensitive material, a monochrome CRT and, for example, a filter turret having three color filters of R, G and B are used. . At the time of printing a video image, a monochrome image representing a three-color image of a negative image in luminance is sequentially displayed on a display screen of a monochrome CRT. By obtaining a green negative image and a blue negative image, printing them on a photosensitive material in three steps through a video image printing lens and a mirror, and making the CRT display screen dark except for the time required for printing. , The shutter is omitted.

[0007] However, the energized CRT emits a small amount of light even when the display screen is dark. In addition, the CRT does not become stable until a certain time has elapsed from the start of energization.
Since the power needs to be supplied for a certain period of time, the CRT is always supplied with power. Therefore, if the optical path of the optical system is in a standby state in which digital image printing is possible, C
There has been a problem that a slight light appearing on the display screen of the RT causes the photosensitive material to be exposed, that is, so-called fogging.

In order to prevent this fogging, it is conceivable to use a filter turret having a light-shielding element in addition to the three color filters of R, G and B. In this case, the diameter of the turret filter becomes large. Therefore, it is difficult to adopt it in a “digital kit” which is limited in space.

In view of the above-mentioned circumstances, a first object of the present invention is to provide a photographic printing apparatus having a function of printing a video image displayed on a CRT on a photosensitive material through a lens by using a simple structure for the standby. The purpose of the present invention is to prevent the photosensitive material from fogging in the state.

Further, even if the optical path in the optical system is switched to the film exposure system between the time of printing a film image and the time of printing a video image, depending on the configuration of the optical system, the time required for printing a film image may vary. A slight stray light appearing on the display screen of the CRT may cause a fog.

Therefore, a second object of the present invention is to provide a film image recorded on a photographic film via a film image printing lens, and a video image displayed on a CRT via a video image printing lens. In a photographic printing apparatus for selectively printing on a photosensitive material, it is an object of the present invention to prevent the photosensitive material from being covered by stray light from a CRT when a film image is printed.

[0012]

According to a first aspect of the present invention, there is provided a light-blocking device for a photographic printing apparatus, which has a function of printing a video image displayed on a CRT on a photosensitive material through a lens. Means for interposing the lens in the optical path only when an image is printed on a photosensitive material, and interposing a light shielding plate in the optical path other than when the video image is printed. .

According to a second aspect of the present invention, there is provided a light-shielding device for a photographic printing apparatus, wherein a film image recorded on a photographic film is passed through a film image printing lens, and a video image displayed on a CRT is passed through a video image printing lens. A photographic printing apparatus that selectively prints on a photosensitive material, wherein the video image printing lens is interposed in the optical path when the video image is printed on the photosensitive material, and is in the optical path when at least the film image is printed. And a means for intervening a light shielding plate.

In this case, when printing the film image, it is preferable that the means excludes the video image printing lens out of the optical path.

[0015]

According to the present invention, when a video image is not printed, or at least at the time of printing the film image, a light-shielding plate is interposed in the optical path. Alternatively, when printing a film image, it is possible to prevent slight light emitted from the CRT from reaching the photosensitive material.

When printing a film image,
By excluding the video image printing lens outside the optical path, it is possible to more reliably prevent the photosensitive material from being covered by stray light when printing a film image.

[0017]

Embodiments of the present invention will be described below in detail with reference to the drawings. This embodiment is called a “digital kit” for adding a print function of a video image (digital image) displayed on a CRT to a conventional photographic printing apparatus having only a film image (analog image) print function. The present invention is applied to this.

FIGS. 1 and 2 show perspectively only essential parts of a photographic printing apparatus having a configuration substantially similar to that shown in FIG. 8 with a digital kit to which the present invention is applied. It is a schematic front view and a side view. FIG. 3 is an explanatory diagram schematically showing the configuration of the digital kit.

In FIG. 1, a digital kit 3 includes a CRT 4 with a display screen 4a directed upward, and a photographic printing apparatus 1 including a CRT 4.
A digital image display unit 5 fixedly attached to the front surface of the main body 2 and an optical unit 6 removably attached to the space 51 of FIG. 8 from the front side along a rail (not shown) fixed to the main body 2. And is constituted by.

As shown in FIG. 3, the optical unit 6 includes a filter turret 8 having three color filters 7R, 7G, 7B, and a filter turret 8
And a sub-mirror 9 for horizontally reflecting image light transmitted vertically upward through the three color filters 7R, 7G and 7B in order to form an image on the paper 44 of the image light reflected by the sub-mirror 9. The camera includes a video image printing lens 10 having a horizontal optical axis, and a main mirror 11 for reflecting image light emitted from the lens 10 downward toward the paper 44.

On the display screen 4a of the CRT 4, a monochrome image representing a three-color image of a negative image in luminance is sequentially projected, and in synchronization with this, the filter turret 8 is rotated to respectively display a red negative image and a green negative image. Image and blue negative image. The main mirror 11 is provided for switching the main exposure axis, and at the time of printing a film image, the main mirror 11 retreats to the left in FIG. 3 along the horizontal optical axis, and the film image printing lens 43 ( (Fig. 8)
It is configured to allow exposure of the film image light passing through to the surface of the paper 44.

The video image printing lens 10 is movable in a direction perpendicular to its optical axis (vertical direction in FIG. 3) so as to intervene in the optical path S between the mirrors 9 and 11 only when printing a video image. Except when printing video images,
The light shielding plate 13 is configured to be interposed in the optical path S.

The digital image display unit 5 includes:
In order to protect the display screen 4a directed upward from the CRT 4, a shutter 12 that covers the display screen 4a when the optical unit 6 is not mounted is provided. This shutter 1
2 is mechanically opened by a member of the optical unit 6 with the insertion of the optical unit 6 into the space 51 to expose the display screen 4a. Digital image display unit 5
The operation of the optical unit 6 is controlled by the control unit 35.

FIG. 4 is a plan view of the optical unit 6. The main mirror 11 is fixed to a mirror holder 14, and the mirror holder 14 is cross-linked horizontally and horizontally along both side walls extending in the longitudinal direction (the left-right direction in FIG. 4) of the housing 15 of the optical unit 6. Two pipe-shaped rails 1
It is slidably supported on 6,16. In this case, the mirror holder 14 is integrally provided on both sides with support arms 14a, 14b supported by the rails 16, 16 in such a manner that the rails 16, 16 are respectively penetrated. A rack 17 is extended along the rail 16 and a rack 17 is engraved on the support arm 14a along the longitudinal direction.

On the other hand, a mirror driving motor (DC motor) 19 having a pinion 18 meshing with the rack 17 mounted on a rotating shaft is fixed to the housing 15.
Thereby, the main mirror 11 is moved between an exposure position (the position shown in FIG. 4) for exposing the video image from the CRT 4 on the paper 44 and a retracted position for allowing the exposure of the film image on the paper 44. Is configured to obtain.

A photoelectric sensor 20 for stopping the main mirror 11 at the exposure position and a microswitch 21 for stopping the main mirror 11 at the retracted position are fixed to the housing 15.

In the vicinity of the filter turret 8, a filter driving motor (pulse motor) 22 and a filter origin detecting photoelectric sensor 23 are provided, and a lens / light shield driving mechanism 24 is provided. I have.

FIG. 5 is a plan view showing the lens / light shield driving mechanism 24, FIG. 6 is a side view thereof, and FIG. 7 is a front view thereof. 5 and 6 are drawn in a state where the left and right sides are reversed with respect to FIG.

As shown, the lens / light shield driving mechanism 2
4 are two parallel pipe-shaped rails 25, which are bridged in a direction perpendicular to the rails 16, 16 and horizontally.
A pedestal 26 slidably supported along the rails 25, 25 is provided on the pedestal 25, and the video image printing lens 10 and the light shielding plate 13 are fixed on the pedestal 26.

The front surface 26a of the base 26 parallel to the rail 25
, A rack 27 extending parallel to the rail 25 is fixed by screws or the like. A lens driving motor (pulse motor) 28 is fixed to the housing 15, and a pinion 31 connected to a rotation shaft 28 a of the motor 28 via reduction gears 29 and 30 meshes with the rack 27. I have. Therefore, the pedestal 26 moves in the vertical direction in FIG. 5 with the forward / reverse rotation of the motor 28, and the lens 10 or the light shielding plate 13 is selectively interposed in the optical path S.

A photoelectric sensor 32 is fixed to the housing 15 in the direction in which the rack 27 protrudes, and the light-blocking plate 13 moves into the optical path S as shown in FIGS. , The protruding end of the rack 27 is
By intervening between the light emitting element and the light receiving element, the light incident on the light receiving element is blocked.
Is detected, and the motor 28 is stopped. The stop position of the pedestal 26 at which the lens 10 is interposed in the optical path S is determined by the photoelectric sensor 32
Is detected by the number of pulses generated in accordance with the rotation of the motor 28 from the position where the tip is detected.

In the above configuration, when a film image is printed, the main mirror 11 is retracted to the position shown by a broken line 11 'in FIG. 6, and reaches the paper 44 from the film through the film image printing lens 43 (FIG. 8). The optical path of the analog exposure system is formed, and FIGS.
The pedestal 26 moves so as to occupy the position where the light shielding plate 13 blocks the optical path S of the digital exposure system shown in FIG.

Next, when printing a video image, first, the main mirror 11 moves to the position shown by the solid line in FIG. 6, but the light shielding plate 13 is held at a position blocking the optical path S of the digital exposure system, and the standby state is established. Becomes Then, when actually printing a video image, the video image printing lens 10 is interposed in the optical path S instead of the light shielding plate 13 for the first time, and a digital exposure system is formed.

As apparent from the above description, according to the present embodiment, the light shielding plate 13 is interposed in the optical path S except when printing a video image, or at least when printing a film image. It is possible to prevent the photosensitive material from being covered by a small amount of light emitted from the display screen 4a of the CRT 4 when waiting in the printable state or when printing a film image.

Further, since the lens / light shield driving mechanism 24 also serves as a mechanism for moving the light shield 13 into and out of the optical path S, the number of actuators does not need to be increased. Is suitable when the number of actuators is limited as in

The above-described embodiment relates to a case of a photographic printing apparatus having a film image printing function and a video image printing function by adding a “digital kit”. It is needless to say that the present invention can be applied to a photographic printing apparatus having only a video image printing function or a photographic printing apparatus having both functions from the beginning.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing only essential parts in a state where a digital kit to which the present invention is applied is attached to a photographic printing apparatus.

FIG. 2 is a side view thereof.

FIG. 3 is an explanatory view schematically showing a configuration of a digital kit to which the present invention is applied.

FIG. 4 is a plan view of an optical unit of the digital kit.

FIG. 5 is a plan view showing a lens / light shield driving mechanism of the optical unit.

FIG. 6 is a side view thereof.

FIG. 7 is a front view thereof.

FIG. 8 is a schematic configuration diagram of a conventional photographic printing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Photo printing apparatus 2 Photo printing apparatus main body 3 Digital kit 4 CRT 4a Display screen 5 Digital image display unit 6 Optical unit 7R, 7G, 7B Color filter 8 Filter turret 9 Submirror 10 Video image printing lens 11 Main mirror 12 CRT display Screen protection shutter 13 Light shield 14 Mirror holder 15 Housing 16 Rail 17, 27 Rack 18, 31 Pinion 19 Main mirror drive motor 20, 23, 32 Photoelectric sensor 21 Micro switch 22 Filter drive motor 24 Lens / light shield drive Mechanism 26 Pedestal 28 Lens drive motor 35 Control unit 43 Film image printing lens 44 Paper (photosensitive material)

Claims (3)

[Claims] 1. A photographic printing apparatus having a function of printing a video image displayed on a CRT on a photosensitive material via a lens, wherein the lens is interposed in an optical path only when the video image is printed on the photosensitive material. And a means for interposing a light-shielding plate in the optical path except when the video image is printed. 2. A photograph which is selectively printed on a photosensitive material via a film image printing lens for a film image recorded on a photographic film, and a video image displayed on a CRT via a video image printing lens. The printing apparatus, further comprising: means for interposing the video image printing lens in the optical path when the video image is printed on the photosensitive material, and interposing a light shielding plate in the optical path at least when printing the film image. A light-blocking device for a photographic printing device. 3. The apparatus according to claim 2, wherein said means for removing said video image printing lens out of said optical path when said film image is printed.