JPH0887069A - Positioning mechanism for actuator - Google Patents

Abstract

PURPOSE: To adjust a position of an acturator to a home position sensor and to accurately perform the positioning of the actuator with a simple mechanism by joining the actuator to a moving member through a screw and turning it with respect to the moving member. CONSTITUTION: The positioning mechanism for the actuator 32 is constituted of a frame body 30 holding a reflection mirror 28, the actuator 32 attached to the frame body 30 and a stepping motor moving the frame body 30. The actuator 32 is formed in a bar state, and a male screw is engraved at the outer peripheral part of the actuator 32, then the actuator 32 is joined in a state where the male screw pierces a female screw part 32A formed on the frame body 30. In the case of adjusting the home position of the frame body 30, the actuator 32 is rotated with respect to the frame body 30 and the length L of the actuator 32 abutting on a microswitch is adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator positioning mechanism, and more particularly to an actuator positioning mechanism applied to a photographic film printing device, a film image input device, a zoom lens device and the like.

[0002]

2. Description of the Related Art In a photo film printing apparatus, the exposure amount of a negative film frame is measured in advance before printing, and the exposure amount at the time of printing is set for each frame based on the measured exposure amount. The mechanism is such that a reflecting mirror is advanced to the optical axis of the transmitted image light of the negative film irradiated by the light source, and the transmitted image light is guided to the light quantity measuring sensor by the reflective mirror. When the light amount measurement is completed, the reflecting mirror is moved back again.

The reflecting mirror is reciprocally movable within the range on the optical axis of the transmitted image light from the home position by the lead screw driven by the stepping motor, that is, the stepping motor has a predetermined number of pulses. When the signal is output, the stepping motor is driven to stop from the home position position to a predetermined position on the optical axis.

By the way, the reflection mirror cannot accurately guide the transmitted image light toward the light quantity measuring sensor unless it is positioned on the optical axis. Therefore, the actuator that operates the home position sensor is provided in the frame body that holds the reflection mirror so that the position with respect to the frame body is adjustable, and the home position of the reflection mirror is positioned by adjusting the position.

A conventional actuator positioning mechanism is
A long hole formed in the actuator is fitted into the pin projecting on the frame, the actuator is slidably attached along the long hole, and the frame and the actuator are joined by an eccentric pin. By rotating the eccentric pin, the actuator is moved to position the actuator. When positioning is completed, the actuator is fixed to the frame with a set screw.

On the other hand, the zoom lens device also employs the above-described actuator positioning mechanism for finely adjusting the home position of the lens.

[0007]

However, the conventional actuator positioning mechanism has a complicated structure because the pin and the elongated hole must be formed, and the eccentric pin and the set screw are required. Therefore, the number of parts is reduced. There is a drawback that it increases. In addition, the actuator positioning mechanism has a drawback that when the actuator is fixed to the frame with the set screw, the position of the actuator is displaced due to friction of the set screw.

The present invention has been made in view of such circumstances, and an object thereof is to provide an actuator positioning mechanism capable of accurately positioning an actuator with a simple mechanism.

[0009]

In order to achieve the above object, the present invention comprises a motor, and a moving member to which a mirror or a lens is attached and which is reciprocally moved within a range of a predetermined position from a home position by the motor. A home position sensor that detects a home position position of the moving member, and an actuator that is positionally adjustable on the moving member and that actuates the home position sensor by hitting the home position sensor, are provided in an actuator positioning mechanism. In the above, the actuator is screwed to the moving member, and the position up to the home position sensor can be adjusted by rotating the actuator with respect to the moving member.

[0010]

The home position of the moving member is adjusted by rotating the actuator with respect to the moving member by the action of the screw and adjusting the position of the actuator with respect to the home position sensor. Thereby, in the present invention, the positioning of the actuator can be accurately performed with a simple mechanism.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of an actuator positioning mechanism according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a structural diagram showing an embodiment in which a positioning mechanism for an actuator according to the present invention is applied to a photo film printing apparatus.

In the main body 10 of the photographic film printing apparatus shown in FIG. 1, an insertion port 14 for a developed negative film 12 is formed on the side surface thereof. A light source 16 for irradiating the negative film 12 is installed above the negative film 12 inserted from the insertion opening 14. Below the light source 16,
An actuator positioning mechanism 20 described later is provided, and a projection lens 22 is installed below the actuator positioning mechanism 20. The projection lens 22 is installed on the optical axis 24 of the transmitted light of the negative film 12, and the transmitted light can be projected on the photographic paper 26 set below the main body 10. As a result, the photographic image of the negative film 12 is printed on the photographic printing paper 26.

Positioning mechanism 20 for the actuator
Is a frame 3 that is a moving member that holds the reflection mirror 28.
0, an actuator 32 attached to the frame body 30, a stepping motor 34 for moving the frame body 30, and the like. The reflection mirror 28 is fixed to the frame body 30 at a position that reflects the transmitted image light 90 degrees to the right when positioned on the optical axis 24 as shown by the solid line in FIG. The brightness of the transmitted image light reflected by the reflection mirror 28 is measured by a light amount measurement sensor 36 installed on the extension thereof.

The frame 30 has a pin 3 formed at the bottom thereof.
8 is engaged with the recess 42 of the moving piece 40, and the moving piece 40 is screwed to the lead screw 44 directly connected to the stepping motor 34. The lead screw 44 is arranged parallel to the optical axis 46 of the transmitted image light reflected by the reflection mirror 28. The stepping motor 34 is driven and controlled by a signal having a predetermined number of pulses output from the pulse oscillation circuit 48, and the pulse oscillation circuit 48 is driven by a power supply 50 that is driven / stopped by turning on / off an external switch 49. To be done. Therefore, when the external switch 49 is turned on to turn on the power supply 50 and the pulse oscillation circuit 48 outputs a predetermined number of pulse signals to the stepping motor 34, the lead screw 44 is rotated by the driving force of the stepping motor 34. When the lead screw 44 rotates, the moving piece 40 moves the lead screw 4
4 moves the frame body 30 to move the moving piece 40.
And slides in parallel with the optical axis 46 of the transmitted light.

A micro switch 52 (or a photo interrupter 52) which is a home position sensor is provided on the moving path of the frame body 30. The micro switch 52 is installed at a position where it can hit the right end portion 32A of the actuator 32, and when the actuator 32 hits it, the power source 50 is turned off. As a result, the movement of the frame body 30 by the stepping motor 34 is stopped,
The stopped position (the position indicated by the chain double-dashed line in FIG. 1) is the home position of the frame body 30. Also, the frame body 30
Is moved leftward in the drawing from the home position by the stepping motor 34, and the pulse oscillation circuit 4
8 stops at a position corresponding to a predetermined number of pulse signals output from the stepping motor 34, that is, at a position on the optical axis 24.

As shown in FIG. 2, the actuator 32 is formed in a rod shape and has an external thread engraved on the outer peripheral portion thereof, and is screwed to the internal thread portion 32A formed on the frame body 30 so as to penetrate therethrough. . In addition, the actuator 32
A groove 32B for inserting a driver is formed in the right end portion 32A in the figure. Therefore, when a driver is inserted into the groove 32B and the actuator 32 is rotated with respect to the frame body 30, the length L from the right end portion 30B of the frame body 30 to the right end portion 32A of the actuator 32 can be adjusted.

When the home position position of the frame 30 is adjusted by the actuator positioning mechanism configured as described above, the actuator 32 is rotated with respect to the frame 30 and hits the microswitch 52. This can be done simply by adjusting the length L of. As a result, the present embodiment has a simpler structure than the conventional actuator positioning mechanism, and
The actuator can be positioned by a simple operation.

Further, after the positioning is completed, the actuator 3
If 2 is fixed to the frame body 30 with an adhesive, the actuator 3
2 can be prevented from being displaced, and more accurate positioning can be performed by reducing the screw pitch. Further, if the actuator 32 is screw-coupled, that is, if the pitch of the screw is known as in the present embodiment, the actuator 3
The adjustment amount of the actuator 32 can be easily grasped by the rotation angle of 2.

In this embodiment, the actuator positioning mechanism applied to the photographic film printing apparatus has been described, but the invention is not limited to this, and a film image input apparatus for recording a film image on a tape, a magnetic disk or the like, You may apply to a zoom lens apparatus etc.

[0020]

As described above, according to the actuator positioning mechanism of the present invention, the actuator is positioned by screwing the actuator to the moving member and rotating the moving member with respect to the moving member. Therefore, the actuator can be accurately positioned by a simple mechanism.

[0021]

[Brief description of drawings]

[0022]

FIG. 1 is a structural diagram showing an embodiment in which an actuator positioning mechanism according to the present invention is applied to a photographic film printing apparatus.

[0023]

FIG. 2 is a sectional view of an essential part of a positioning mechanism for an actuator according to the present invention.

[0024]

[Explanation of symbols]

 10 ... Photo film printing apparatus main body 20 ... Actuator positioning mechanism 28 ... Reflective mirror 30 ... Frame body 32 ... Actuator 34 ... Stepping motor 44 ... Lead screw 48 ... Pulse oscillation circuit 52 ... Micro switch

Claims (1)

[Claims] 1. A motor, a moving member to which a mirror or a lens is attached and which is reciprocally moved by the motor within a predetermined position range from a home position position, a home position sensor for detecting a home position position of the moving member, and An actuator positioning mechanism comprising: an actuator which is provided on a moving member so as to be adjustable in position and which operates the home position sensor by hitting the home position sensor; wherein the actuator is screwed to the moving member, A positioning mechanism for an actuator, wherein a position up to a home position sensor can be adjusted by being rotated with respect to a member.