JPH10171015A - Position adjusting device for swing back type mirror - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust the horizontal inclination of a swing back type mirror. SOLUTION: The shafts 5, 8 of a main mirror arm 4 and sub-mirror arm 7, which respectively drive first and second pins 3, 6 projectingly disposed on the right flank of a mirror holder 2 are pivotally fitted to both ends of a horizontal adjusting plate 11. This horizontal adjusting plate 11 is mounted at a perpendicular adjusting plate 12 displaceably in a lateral direction by means of a lock screw 13, a guide pin 14 and a long hole 12a. This perpendicular adjusting plate 12 is fixed to the right flank 1a of a mirror box 1 displaceably in the perpendicular direction by means of a lock screw 15 and a long hole 12b. The left flank of the mirror box 1 is provided with corresponding first and second pins, main and sub-mirror arms respectively. The respective shafts are journaled to the left flank of the mirror box 1. The inclination of the mirror holder 2 is adjusted by adjusting the horizontal and perpendicular adjusting plates 11, 12 and laterally and vertically displacing the shafts 5, 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing-back type mirror position adjusting device for adjusting a horizontal tilt of a single-lens reflex camera in a lowered state.

[0002]

2. Description of the Related Art A mirror of a single-lens reflex camera is required to have a long back focus as long as possible while preventing the mirror from being broken by increasing its length. As a mirror driving method that satisfies such conflicting demands, there is a swingback type mirror driving mechanism in which a mirror holder holding a mirror is flipped up while being retracted.

FIG. 4 is a side view showing an example of this. A first pin 3 is implanted in a projection 2a projecting from an intermediate portion of the side surface of a mirror holder 2 housed in a mirror box 1. The first pin 3 is connected near the tip of a U-shaped main mirror arm 4, and the base of the main mirror arm 4 is pivotally connected to the side surface of the mirror box 1 with a shaft 5. A roller 6a is rotatably mounted on a second pin 6 planted at the base end of the side surface of the mirror holder 2, and the roller 6a is loosely fitted to the cam hole 1c of the mirror box 1 so as to freely roll. . Then, the oblique angle of the mirror holder 2 is determined by a mirror angle regulating pin 9 protruding from the mirror box 1 so as to be adjustable.

The other side surfaces of the mirror box 1 and the mirror holder 2 have similar cam holes at positions corresponding to FIG.
First and second pins, rollers and the like are provided. The first pin is connected to the vicinity of the tip of the other side of the main mirror arm 4, and its base is pivotally connected to a shaft corresponding to the shaft 5. I have.

When the main mirror arm 4 is rotated counterclockwise about the shaft 5 in such a configuration, the second pin 6 of the mirror holder 2 is rotated by the cam hole 1c via the roller 6a.
The first pin 3 is displaced obliquely upward and rearward by being guided by
It moves on an arc with the shaft 5 as a fulcrum, and is displaced to a rising position indicated by a virtual line in FIG. At this time, the mirror holder 2 is flipped up while retracting, so that a lens having a short back focus can be mounted.

FIG. 5 is a side view showing another example of the swing-back type mirror driving mechanism. The second pin 6 provided on the side surface of the mirror holder 2 shown in FIG. 7, the base of which is connected to the mirror box 1 by a shaft 8 without the roller 6a and the cam hole 1c shown in FIG. The other configuration is the same as that of FIG.

When the main mirror arm 4 is rotated counterclockwise about the shaft 5 in such a configuration, the sub-mirror arm 7 is rotated about the shaft 8 in the same direction via the mirror holder 2 and the mirror is rotated. The first and second pins 3 and 6 of the holder 2 move on an arc with the shafts 5 and 8 as fulcrums, and are displaced to a raised position indicated by a virtual line in FIG. Also at this time, the mirror holder 2 is flipped up while retreating similarly to FIG.
FIG. 5 shows the driving of the mirror holder 2 shown in FIG. 4 because the first and second shafts 3 and 6 of the mirror holder 2 are supported by the main mirror arm 4 and the sub-mirror arm 7, respectively. It has the advantage of being smoother and more reliable, and is the mainstream of the current swing-back type mirror drive mechanism.

[0008]

However, in such a conventional swing-back type mirror driving mechanism,
In the former, the position of a first pin 3 protruding from both left and right sides of a mirror holder 2 is regulated by a main mirror arm 4 pivotally mounted on a shaft 5 of the mirror box 1, and the second pin 6 is connected to a mirror. Since the position is regulated by the cam hole 1c of the box 1, the left and right first and second pins 3, 6
If there is a slight error in the position of the mirror holder 2, the position of the shaft 5, the position of the cam hole 1c, or the shape of the left and right arm portions of the main mirror arm 4, there is a problem that the left and right sides of the mirror holder 2 are inclined from the horizontal direction. Was.

In the latter case, the first pins 3 protruding from the left and right sides of the mirror holder 2 are connected to the shaft 5 of the mirror box 1.
The position of the second pin 6 is regulated by a sub-mirror arm 7 pivotally attached to a shaft 8 of the mirror box 1. Therefore, in this case as well, there are slight errors in the positions of the left and right first and second pins 3 and 6, the positions of the axes 5 and 8, or the shapes of the left and right arm portions of the main mirror arm 4 and the sub mirror arm 7. And the right and left sides of the mirror holder 2 are inclined from the horizontal direction. And
In any case, there is no means for adjusting the inclination of the mirror holder 2 in the left-right direction.

FIG. 6 shows a state in which the mirror holder 2 is inclined leftward from the horizontal direction in the conventional example shown in FIG. If there is no horizontal tilt of the mirror holder 2,
The horizontal light rays along the optical axis A of the taking lens L are turned at right angles by the mirror M of the mirror holder 2, become vertical light rays along the finder optical axis FA, and are viewed through the eyepiece EL. At this time, the finder screen surface FS is a horizontal plane orthogonal to the finder optical axis FA.

Here, assuming that the horizontal direction of the mirror M of the mirror holder 2 is inclined leftward by an angle Δ in the figure, the finder optical axis FA ′ is shifted leftward by an angle 2Δ and becomes a finder screen surface FS ′. Conventionally, mirror M
Since there was no means for adjusting the horizontal direction of the finder, the finder screen surface FS 'was moved to the finder optical axis F.
The focus adjustment around the finder image is performed by tilting the finder image so as to be orthogonal to A '.

However, when the finder optical axis FA is inclined by an angle 2Δ, the finder screen center C moves to a point C '. Normally, the angle of the finder screen surface FS from the horizontal plane can be adjusted to some extent, but its position cannot be moved in the horizontal direction, so that the finder screen center C remains as it is. This means that the center of the finder visual field deviates from the center of the real screen.

When the inclination of the mirror M is within the range in which the angle of the finder screen surface can be adjusted and the finder field is within the range of the actual screen, the mirror M can be adjusted.
If it is tilted any further, it cannot be adjusted. The present invention has been made in view of the above points, and has as its object to provide a position adjusting device for a swingback mirror that can adjust the horizontal inclination of the swingback mirror.

[0014]

According to the present invention, a first pin and a second pin provided at an intermediate portion and a proximal end portion of both sides of a mirror holder for holding a mirror of a single-lens reflex camera are provided. A swingback-type mirror position adjusting device in which a pin is driven by a main mirror arm and a sub-mirror arm rotatably provided on both side surfaces of a mirror box, so that the mirror holder is flipped up while retracting. A position of a swing-back type mirror having a fulcrum variable means for pivotally mounting the main mirror arm and the sub mirror arm on one side of the mirror box and displacing the fulcrum positions of the main mirror arm and the sub mirror arm on the other side. An adjusting device is provided.

In the above apparatus, the fulcrum variable means comprises a horizontal adjustment plate and a vertical adjustment plate for moving the fulcrum of the main mirror arm and the sub mirror arm in the horizontal and vertical directions, respectively. It is preferable that one of the vertical adjustment plates can be fixed to the other and the other can be fixed to the side of the mirror box in an adjustable manner, and the horizontal adjustment plate and the vertical adjustment plate can be adjusted independently. It is.

[0016]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a right side view of a mirror box showing one embodiment of the present invention, and FIG. 2 is a left side view of the same. Here, the right side surface and the left side surface indicate directions viewed from the photographing lens side.

FIG. 1 shows a right side 1a of the mirror box 1.
As shown in FIG.
a main mirror arm 4 for driving the first pin 3 planted on the mirror holder 2, and a second mirror planted at the base on the right side of the mirror holder 2.
And a sub-mirror arm 7 for driving the pin 6 of FIG. The shaft 5 as a fulcrum of the main mirror arm 4 and the shaft 8 as a fulcrum of the sub-mirror arm 7 are provided at both ends of a Z-shaped horizontal adjustment plate 11.

The horizontal adjusting plate 11 has a cross-shaped vertical adjusting plate 12 and horizontal elongated holes 12a, 12a and fixing screws 1a.
The vertical adjustment plate 12 can be displaced in the vertical direction in the figure by the vertically long holes 12b, 12b and the fixing screws 15, 15 by using the vertical holes 3b, 3b and the guide pins 14, 14. Is mounted on the right side surface 1a of the mirror box 1 to constitute a fulcrum variable means 10 which enables the fulcrum positions of the main mirror arm 4 and the sub mirror arm 7 to be displaced.

Below the right side surface 1a of the mirror box 1, there is provided a mirror angle regulating pin 9 which engages with the lower surface of the mirror holder 2 and regulates the oblique angle (45 degrees) of the mirror M. This mirror angle regulating pin 9 is
The mirror angle adjusting cam 1 which is fixed to the free end of a mirror angle regulating lever 18 pivotally attached to the right side surface 1a by a shaft 16 and urged in the counterclockwise direction by a spring 17 and comprises an eccentric cam.
The position is made variable by the rotation of No. 9.

On the other hand, on the left side 1b of the mirror box 1, as shown in FIG. 2, a main mirror arm for driving a first pin 3 'implanted in a projection 2a' in the middle of the left side of the mirror holder 2. 4 'and a sub-mirror arm 7' for driving a second pin 6 'implanted at the base of the left side surface of the mirror holder 2, and a shaft 5' serving as a fulcrum of the main mirror arm 4 'and the sub-mirror arm 7'. 8 'is mirror box 1
The shaft is directly fixed to the left side surface 1b.

In the position adjusting device of the swingback type mirror having the above-mentioned structure, the horizontal and vertical adjusting plates 11 and 12 are fixed by fixing the fixing screw 13 on the right side 1a of the mirror box 1 shown in FIG. Fixing screw 15 while fixed
Is loosened, the vertical adjustment plate 12 can be displaced in the vertical direction together with the horizontal adjustment plate 11, and the shafts 5 and 8 on the horizontal adjustment plate 11 are displaced to raise and lower the fulcrum positions of the main mirror arm 4 and the sub mirror arm 7. It is possible to adjust in the direction.

Further, the fixing screw 15 is fixed to fix the fixing screw 1
When the vertical adjustment plate 12 is loosened, only the horizontal adjustment plate 11 can be displaced in the left-right direction while the vertical adjustment plate 12 is fixed, and the main mirror arm 4 and the sub mirror arm are displaced by displacing the shafts 5 and 8 on the horizontal adjustment plate 11. 7 can be adjusted in the left-right direction.

On the other hand, on the left side 1b of the mirror box 1 shown in FIG. 2, both the axis 5 'of the main mirror arm 4' and the axis 8 'of the sub mirror arm 7' are fixed to the left side 1b of the mirror box 1. The right side axis 5,
The horizontal and vertical inclinations of the mirror M can be adjusted by moving the positions of the first and second pins 3 and 6 of the mirror holder 2 by the displacement of the mirror 8 in the vertical and horizontal directions. The angle adjustment when the mirror holder 2 is lowered is performed by the mirror angle adjusting cam 19.
Is rotated, and the mirror angle regulating lever 18 is swung to move the mirror angle regulating pin 9 up and down.

FIG. 3 shows a viewfinder optical system of the single-lens reflex camera adjusted as described above.
The horizontal ray along the optical axis A of the mirror holder 2
, And becomes a vertical ray along the finder optical axis FA and is viewed through the eyepiece EL. At this time, the mirror M
Is adjusted by horizontal and vertical adjusting plates 11 and 12, and the oblique angle adjustment is adjusted by a mirror angle regulating pin 9, so that the reflected optical axis is changed as shown in FIG. It can be completely matched with the axis FA.

In the above embodiment, the horizontal adjustment plate 1
1, a vertical adjustment plate 12 is mounted so as to be displaceable in the horizontal direction,
The vertical adjustment plate 12 is mounted on the mirror box 1 so as to be vertically displaceable, and the horizontal adjustment plate 11 is provided with the axes 5 and 8 of the main mirror arm 4 and the sub-mirror arm 7. The horizontal adjustment plate 11 is mounted to be displaceable in the vertical direction, and the horizontal adjustment plate 11 is mounted to the mirror box 1 so as to be displaceable in the horizontal direction.
Axis 5 of main mirror arm 4 and sub mirror arm 7
8 may be provided.

[0026]

As described above, the position adjusting device for the swing-back type mirror according to the present invention is a main mirror for driving the first and second pins provided at the intermediate portion and the base end portion of the side surface of the mirror holder. Since the fulcrum variable means for displacing the fulcrum position of the arm and the sub-mirror arm is provided, the horizontal tilt of the mirror due to a processing error of the mirror box, etc., which was impossible to adjust conventionally, is adjusted so that the finder optical axis is at the center of the finder screen. And the finder field of view can be made to completely match the actual screen.

If the fulcrum variable means comprises a horizontal adjustment plate and a vertical adjustment plate for moving the fulcrum of the main mirror arm and the sub-mirror arm in the horizontal and vertical directions, the mirror can be tilted in any direction. If the horizontal adjustment plate and the vertical adjustment plate can be adjusted independently of each other, quick adjustment can be performed according to the tilt direction of the mirror.

[Brief description of the drawings]

FIG. 1 is a right side view of a mirror box showing an embodiment of the present invention.

FIG. 2 is a left side view of the same.

FIG. 3 is an explanatory view showing the finder optical system.

FIG. 4 is a side view showing an example of a conventional swing-back type mirror driving mechanism.

FIG. 5 is a side view showing another example of the conventional swing-back type mirror driving mechanism.

6 is an explanatory diagram showing a finder optical system of the single-lens reflex camera having the swing-back type mirror driving mechanism shown in FIG.

[Explanation of symbols]

1: mirror box 2: mirror holder 3, 3 ': first pin 4, 4': main mirror arm 5, 5 ': shaft 6, 6': second pin 7, 7 ': sub-mirror arm 8, 8 ': Axis 9: mirror angle regulating pin 10: fulcrum variable means 11: horizontal adjusting plate 12: vertical adjusting plate 18: mirror angle regulating lever 19: mirror angle adjusting cam

Claims (3)

[Claims] 1. A first pin and a second pin provided at an intermediate portion and a base end portion of both sides of a mirror holder for holding a mirror of a single-lens reflex camera are rotatably provided on both sides of a mirror box. A position adjusting device for a swing-back type mirror, which is driven by a main mirror arm and a sub-mirror arm to flip up a mirror holder while retracting, wherein the main mirror arm and the sub-mirror arm are provided on one side surface of the mirror box. A swing-back-type mirror position adjusting device, which is provided with a fulcrum variable means for pivotally connecting the fulcrum and displacing the fulcrum positions of the main mirror arm and the sub-mirror arm on the other side. 2. The fulcrum variable means includes a horizontal adjustment plate and a vertical adjustment plate for moving the fulcrum of the main mirror arm and the sub mirror arm in the horizontal direction and the vertical direction, respectively.
Either the horizontal adjustment plate or the vertical adjustment plate to the other,
2. The position adjusting device for a swing-back type mirror according to claim 1, wherein the other is adjustable so as to be fixed to a side surface of the mirror box. 3. The horizontal adjustment plate and the vertical adjustment plate can be adjusted independently of each other.
The position adjusting device of the swingback type mirror as described in the above.