JPS6230012Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for adjusting the mounting position of an automatic focus detection element in a camera.

In a camera equipped with an automatic focus detection element that automatically detects focus, for example, in the case of a single-lens reflex camera, a part of the light from the subject that enters through the photographic lens is detected by the focus detection mechanism using an optical system. There is a system (Lights-Corefoto system) that uses the detection element to obtain a signal during focusing to control the amount of movement of the photographic lens.

However, when adopting the above automatic focus detection method,
When assembling the focus detection element into a predetermined position within the camera, it is essential to adjust the position of the element after assembly due to processing accuracy. Since it is necessary to adjust the distance from the flange surface while maintaining parallelism or perpendicularity, this adjustment is extremely difficult.

In view of this, the present invention makes it possible to adjust the distance from the flange surface after the focus detection element is installed by adjusting the distance with a single adjustment screw without affecting the parallelism or perpendicularity to the flange surface. The object of the present invention is to provide an apparatus for adjusting the mounting position of an automatic focus detection element in a camera, which facilitates adjustment work after mounting.

Hereinafter, the present invention will be described with reference to embodiments shown in the drawings.

In this embodiment, as schematically shown in FIG. 1, a focus detection element 1 is located at the bottom of the camera body at right angles to the flange surface, and a part of the incident light from the photographic lens 2 is used for focus detection. A case is shown in which the mirror 3 is arranged so as to be guided by a 90° transformation.

FIG. 2 shows a specific example of the configuration.

In the figure, the first swinging member 4 has a U-shape in plan view, and the base ends of its arm portions 4A, 4B are pivoted toward the camera body side by shafts 5, 5, and the free end portion 4C is in the vertical direction. It is said that it is possible to move to

Left and right arm portions 4A of the first swinging member 4,
Bearing parts 6A, 6 of the focus detection element support substrate 6 supporting the focus detection element 1 near the free end 4C between 4B
A is pivotally supported by a shaft 7, and a free end 6B facing in the opposite direction to the free end 4C of the focus detection element first swinging member 4 is vertically swingable.

The second swinging member 8 is provided parallel to one arm portion 4A of the first swinging member 4, and has a base end located on the free end portion 4C side of the first swinging member 4 by a 9. It is pivoted on the camera body side.

This second swinging member 8 has a support pin 10 at the tip of the side surface facing the first swinging member 4.
Furthermore, transmission pins 11 are provided in a protruding manner at intermediate portions between this and the shaft 9, and the support pins 10 are engaged with the lower surface of the focus detection element support substrate 6.
1 is engaged with the upper surface of the arm portion 4A of the first swinging member 4. The spring 12 is connected to the focus detection element support substrate 6
This is for stably contacting the support pin 10.

The tip of an adjustment screw 14 screwed into the camera body comes into contact with the lower surface of the contact portion 13 protruding from the free end 4C of the first swinging member 4. By rotating, the free end portion 4C of the first swinging member 4 can be moved in the vertical direction.

Next, the operation of the above embodiment will be explained.

In FIG. 3, when raising the focus detection element 1 and adjusting it in the direction of shortening the distance between the flange surface and the element surface, the free end 4C of the first swinging member 4 is tightened by tightening the adjustment screw 14. When it is raised, the transmission pin 11 is raised accordingly, causing the second swinging member 8 to swing clockwise in the figure. As a result, the support pin 10 rises, raising the free end 6B side of the focus detection element support substrate 6.

As a result, the rise of the pivot side of the focus detection element support substrate 6 due to the rise of the free end portion 4C of the first swinging member 4 is compensated for by the rise of the support pin 10, and the focus detection element support substrate 6 is raised. Raise without displacement.

When the focus detection element support substrate 6 is to be lowered, it can be lowered by rotating the adjustment screw 14 in the direction of loosening, in the opposite manner to the above.

In this case, the distance between the shaft 9 and the transmission pin 11 is
L ₁ , the inter-axle distance L ₂ between the shaft 9 and the support pin 10, and the inter-axle distance L ₃ between the shafts 5 and 7 are set in a fixed relationship, for example, L ₂ =L ₁ ·L ₃ /L ₃ -L ₁ By setting this, it is possible to equalize the amount of elevation of the first swing member 4 and the second swing member 8.

In addition, when the focus detection element 1 is provided parallel to the flange surface, the entire structure including the focus detection element support substrate 6 may be rotated by 90 degrees.

As explained above, the focus detection element mounting position adjustment device according to the present invention allows the focus detection element to be adjusted by simply rotating the adjustment screw even after the focus detection element is set parallel or perpendicular to the flange surface of the camera body. The distance from the flange surface can be adjusted while maintaining its parallelism or perpendicularity, and therefore adjustment work once assembled can be made extremely easy.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing an example of the installation position of a focus detection element in a single-lens reflex camera, and FIG. 2 is a perspective view showing an example of the installation position adjustment device for the focus detection element of the present invention. FIG. 3 is a side view of the same, and FIG. 4 is an explanatory view showing the same operating state. 1...Focus detection element, 2...Photographing lens, 3...
...Mirror for focus detection, 4...First swinging member, 4
A, 4B...Arm part, 4C...Free end part, 5,
7, 9... Axis, 6... Focus detection element support substrate, 6
A...Bearing part, 6B...Free end part, 8...Second swinging member, 10...Support pin, 11...Transmission pin, 12...Spring, 13...Abutting part, 14... Adjustment screw.

Claims (1)

[Scope of utility model registration request] A first swinging member having one end pivoted to the camera body side, a focus detection element support substrate having one end pivoted to a position apart from the pivot of the swinging member, and a focus detection element support substrate having one end pivoted to the camera side. a second swinging member, the support pin provided at the tip of the second swinging member is engaged with the free end of the focus detection element support substrate, and a support pin is provided between the pin and the pivot shaft. A provided transmission pin is engaged with the first swinging member, an adjusting screw is provided at the free end of the first swinging member to swing the first swinging member, and the first swinging member is controlled by the adjusting screw. When the free end of the focus detection support substrate is oscillated, the second oscillation member is caused to follow and its support pin moves the free end of the focus detection element support substrate by the same amount in the same direction. A mounting position adjustment device for an automatic focus detection element in a camera, characterized in that: