JPH01193726A - Photographic printer - Google Patents

Abstract

PURPOSE:To securely arrange a lens on an optical axis of printing by stopping driving a turret before an opening and the lens reach the optical axis, and then rotating the turret by its inertial and pressing a projection against the outer periphery of the turret. CONSTITUTION:In printing operation, a solenoid 78 is excited to extract a projection part 72A from a recessed part 74A, and a motor 41 is driven to rotate the turret 38 clockwise, so that lenses 24A-24F are selected and arranged on the optical axis P. Namely, when the turret 38 is rotated and a stop pin 64A corresponding to the selected lens is detected by a stop sensor 68, the driving of the motor 41 is stopped a specific time later and the turret 38 rotates by its inertial force. In this state, when the stop pin 64 is detected by the stop sensor 68, the excitation of the solenoid 78 is eliminated and an arm 72 enters the recessed part 74B with the energizing force of a leaf spring 76, so that the turret 38 stops rotating immediately. Consequently, the selected lens among the lenses 24A-24F is accurately arranged on the optical axis.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a photographic printing apparatus that can perform printing by sequentially aligning a plurality of printing lenses with the optical axis.

[Background Art] A photo printing device is used in which a plurality of lenses are attached along the circumferential direction to a turret that rotates around an axis, and these lenses are sequentially aligned with the printing optical axis to change the printing magnification. .

In order to automatically control this photographic printing apparatus, it is necessary to detect which lens is on the printing optical axis, and therefore it is necessary to provide a plurality of detection means corresponding to each lens.

The present invention has been made in consideration of the above-mentioned facts, and an object of the present invention is to provide a photographic printing apparatus that can reliably position each lens on the printing optical axis using a simple detection sensor.

[Summary and operation of the invention] The present invention is a photographic printing apparatus in which a turret that rotates about an axis is provided with a plurality of lenses, and these lenses are placed on a printing optical axis by rotation of the turret to perform printing, an aperture display means provided on the turret for displaying an aperture to which no lens is attached; a lens display means provided on the turret for displaying each of the lenses; an aperture detection sensor for detecting the aperture display means; and the lens display. a lens detection sensor for detecting the means; an engaging means for preventing rotation of the turret by a protrusion entering a recess on the outer periphery of the turret when the aperture and lens reach the optical axis; and an engagement means for preventing rotation of the turret when the aperture and lens reach the optical axis The turret is characterized in that it has a control means that stops driving the turret before rotating the turret by inertia and presses the protrusion toward the outer periphery of the turret.

For this reason, in the present invention, for example, the reference position is a state in which the aperture of the turret without a lens is placed on the printing optical axis, and since the aperture detection sensor detects this at this reference position, the control means can easily locate the aperture at the reference position. be able to judge something,
When one of the lenses is rotated from this reference position until it is placed on the optical axis, the lens detection sensor detects this and can accurately place the lens on the optical axis. In particular, the control means stops driving the turret before the lens reaches the optical axis, rotates the turret by inertia, and presses the protrusion toward the outer periphery of the turret. When the lens is placed on the optical axis, the protrusion is pushed into the recess on the outer periphery of the turret. It is possible to enter the lens and reliably route the lens to the printing optical axis.

[Embodiment of the Invention] FIG. 2 shows an upright type photographic printing apparatus 10 to which an embodiment of the invention is applied. A negative carrier 16 can be mounted on the base plate 14 of the housing 12, and the negative film 1 is inserted into the negative carrier 16.
8 is loaded.

Inside the housing 12, a light source 20, an MMC filter 21, a mirror 21A, and a light diffusion tube 22 are provided coaxially with the negative carrier 16, and printing light is sent to the photographic paper 28 through a printing lens 24 and a shutter 26. There is. This housing 12 is attached to a part of a belt 34 that is passed around a pulley 30.32, and the pulley 30.32 is movable in the vertical direction in FIG. 2 by receiving the driving force of a motor (not shown).

The lens 24 is attached to a turret 38, and the turret 38 is mounted on a lifting platform 40 that is pivotally supported to the housing 12 by a screw shaft 36. The turret 38 is rotated by the drive of a motor 41 attached to the lifting platform 40.

Further, the lifting platform 40 is prevented from rotating, and when the screw shaft 36 is rotated by the driving force of a motor (not shown), the turret 38
The conjugate length of the lens 24 can be changed by moving up and down.

A reflective mirror 42 is disposed within the housing 12 and is slidable in the horizontal direction. Also, the reflective mirror 42
is attached to a belt 44, which is wound around pulleys 46 and 48. When these pulleys 46 and 48 receive the rotational force of a motor (not shown), the reflection mirror 42 moves in the left-right direction in FIG. 2, so that it can advance and retreat on the optical axis.

The reflecting mirror 42 reflects the printing light from the light source 20 and sends it to two image sensors 56 and 58 via a zoom lens 52 and a beam splitter 54. In the image sensors 56 and 58, a negative image of a size corresponding to the negative size is formed by the zoom lens 52, and each point of this negative image is scanned and photometered.

As shown in FIG. 1, a rectangular opening 60 is formed in the turret 38 to allow printing light to pass through during photometry. Further, a plurality of lenses 24 (24A to 24F) are attached to this turret 38 around the axis,
Each can be placed on the printing optical axis P.

Note that in FIG. 1, the aperture 60 is placed on the printing optical axis P.

The turret 38 is used to indicate the mounting position of this opening 60.
A pin 62 is protruded from the surface thereof and corresponds to an opening detection sensor 66. Further, a stop pin 63 is protruded further away from the axis of the turret 38 than the pin 62 and also slightly offset from the pin 62 in the circumferential direction, and corresponds to the stop sensor 68 . These sensors 66,68 are supported to the housing 12 via brackets 69.

Therefore, when the pin 62 corresponds to the aperture detection sensor 66 as shown in FIG. 1, the aperture 60 is arranged on the printing optical axis P.

Pins 63A and 63B are provided on the turret 38 with the same radius as the stop pin 63 from the axis and with included angles θ on the left and right sides of the stop pin 63.

Further, stop pins 64 for displaying the mounting positions of the lenses 24A to 24F are provided on the turret 38, similarly to the stop pins 63, and each lens is detected by the stop sensor 68 when aligned on the optical axis P. It is now possible to do so. Further, stop pins 64A and 64B are similarly provided on the left and right sides of these stop pins 64, separated by an angle θ. The angle θ in this example is 15°.

These stop pins 63'A, 63B, 64A.

64B is detected, the driving force of the motor 41 is stopped after a predetermined time delay (which is shorter than the time it takes for the turret 38 to rotate by an angle θ). Therefore, the turret 38 has pins 63A, 63B, 64A, 64
After a predetermined period of time has elapsed after B was detected, the driving force disappears and the shaft is rotated by inertial force.

As shown in FIG. 1, an arm 72 supported by a shaft 70 is disposed on the outer periphery of the turret 38. This arm 7
2 has a protrusion 72A at the tip, and the turret 38
The opening 60 corresponds to the recessed portion 74A and the recessed portion 74B provided at the center of each lens 24A to 24F. This arm 72 is pressed against the outer periphery of the turret 38 by the urging force of the leaf spring 76, and when the solenoid 78 is energized, the arm 72 is pressed against the outer periphery of the turret 38 against the urging force of the leaf spring 76. They are now separated.

Therefore, this arm 72 has pins 63A and 63B.

64A164B is detected by the stop sensor 68, the driving force of the motor 41 is stopped after a predetermined delay, and then the turret 3
8 is rotating due to inertial force, when the stop sensor 68 detects the stop pins 63 and 64, the excitation of the solenoid 78 is canceled and the protrusion ? 2A enters into the recess 74A or 74B to accurately align the aperture 60 or lens 24 with the printing optical axis.

Next, the operation of this embodiment will be explained.

When printing, place the negative film 18 in the negative carrier 1.
6, and this negative carrier 16 is mounted on the base plate 14.

Here, when a photometry button (not shown) is pressed, image information of the negative film 18 is detected. That is, as shown in FIG. 2, the belt 44 is driven to position the reflecting mirror 42 on the optical axis, and the motor 41 is driven to rotate the turret 38 to open the aperture 6.
0 corresponds to the optical axis. The aperture 60 is accurately positioned on the optical axis by the pin 62 being detected by the aperture detection sensor 66.

In this case, it is unknown at which rotation angle the turret 38 is stopped, and as the turret 380 rotates, the pin 62 is detected by the opening detection sensor 66, and the rotation of the turret 38 is stopped. In order to accurately stop the aperture 60 on the optical axis P regardless of the inertial force of the turret 38, the following control is performed. That is, when the turret 38 is rotated clockwise in FIG. 1 and the stop pin 63A is detected by the stop sensor 68 before the pin 62 is detected by the opening detection sensor 66, the driving force of the motor 41 is stopped and the turret 38 is rotated. Move by inertia. When the stop pin 63 is detected by the stop sensor 68 while the turret 38 is rotating due to inertial force, the solenoid 78 is de-energized and the protrusion 72 is moved by the biasing force of the leaf spring 76.
A is pressed against the outer periphery of the turret 38. Therefore, the protrusion 7
2A corresponds to the recess 24A and enters the recess 74A, so the turret 38 can reliably stop the aperture 60 on the optical axis P.

In this state, the printing light emitted from the light source 20 is diffused by the light diffusion tube 22 and illuminates the negative film 18. The light transmitted through this negative film 18 is transmitted through the turret 380 and the aperture 60.
and is reflected laterally by the anti-semi-mirror 42. Further, the reflected light passes through a zoom lens 52, is split into two by a beam splitter 54, and enters image sensors 56 and 58, respectively. A negative image of a size corresponding to the negative size is formed on these image sensors 56 and 58 by the zoom lens 52, and each point of this negative image is subjected to scanning photometry.

The image sensors 56 and 58 measure the density of each point on the negative image, and the printing exposure amount is calculated based on the obtained measured values.

When printing, the solenoid 78 is energized and the protrusion? 2
A is pulled out from the recess 74A, and the turret 38 is rotated clockwise in FIG. In this case, in the same way that the aperture 60 is placed on the printing optical axis, when the turret 38 is rotated and the stop pin 64A corresponding to the lens to be selected is detected by the stop sensor 68, the motor 41 is driven after a predetermined period of time. stops, and the turret 38 rotates due to inertia. When the stop pin 64 is detected by the stop sensor 68 in this state, the solenoid 78
is de-energized, the arm 72 moves into the recess 74B by the biasing force of the leaf spring 76, the rotation of the turret 38 is immediately stopped, and the selected lenses 24A to 24F are accurately positioned on the optical axis.

At the same time, the reflecting mirror 42 moves rightward in FIG. 2 and is retracted from the printing optical axis. Here, the shutter 26 is opened for a time corresponding to the printing exposure amount, and the image on the negative film is printed onto the photographic paper 28.

In the above embodiment, when the aperture 60 shown in FIG. 1 is always placed on the optical axis and any of the lenses 24A to 24F is selected, these lenses 24 are moved from the state shown in FIG. 1 to the right. Alternatively, the turret 38 can be rotated clockwise or counterclockwise by quickly determining whether the turret 38 is placed on the optical axis by either rotation to the left. Also, stop pins 64A, 6
4B is detected before the stop pin 64 when the turret 38 is rotated in either the clockwise or counterclockwise rotation direction shown in FIG.
8 can be rotated by inertia force, and the protrusion 72A can be inserted into the recess 74B.

[Effects of the Invention] As explained above, the present invention is a photographic printing apparatus in which a plurality of lenses are provided on a turret that rotates around an axis, and these lenses are placed on the printing optical axis by rotation of the turret to perform printing. an aperture display means provided on the turret for displaying an aperture to which no lens is attached; a lens display means provided on the turret for displaying each of the lenses; and an aperture detection sensor for detecting the aperture display means; a lens detection sensor that detects the lens display means; an engaging means that prevents rotation of the turret by inserting a projection into a recess on the outer periphery of the turret when the aperture and the lens reach the optical axis; and a lens detection sensor that detects the lens display means; It has a control means that stops driving the turret before reaching the axis, rotates the turret by inertia, and presses the protrusion toward the outer periphery of the turret, so the aperture or lens can be reliably positioned on the printing optical axis with a simple configuration. It has excellent effects.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a turret to which the present invention is applied, FIG. 2 is a longitudinal cross-sectional view of a photographic printing apparatus to which the present invention is applied, and FIG. 3 is a cross-sectional view taken along the line III--III in FIG. . 24... Lens, 38... Turret, 41... Motor, 60... Aperture, 62... Pin, 64.64A, 64B... Stop pin, 66... Opening detection sensor, 68 ...Stop sensor, 72...Arm, 72A...Protrusion, 74A, 74B...Recess.

Claims (1)

[Claims] (1) A photographic printing apparatus in which a plurality of lenses are provided on a turret that rotates around an axis, and these lenses are placed on the printing optical axis by rotation of the turret to perform printing, and the turret is provided with a plurality of lenses. an aperture display means for displaying an unattached aperture; a lens display means provided on the turret for displaying each of the lenses; an aperture detection sensor for detecting the aperture display means; and a lens detection sensor for detecting the lens display means. and an engaging means for preventing rotation of the turret by inserting a protrusion into a recess on the outer periphery of the turret when the aperture and lens reach the optical axis, and stopping driving of the turret before the aperture and lens reach the optical axis. 1. A photographic printing apparatus comprising control means for rotating the turret by inertia and pressing the protrusion against the outer periphery of the turret.