JPS6140971B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a camera capable of photographing by changing the focal length by adding an auxiliary lens to the main lens, such as those disclosed in Japanese Patent Laid-Open No. 52-76919 and No. 54-33027. The purpose of this publication is to add an auxiliary lens in conjunction with the operation of changing the distance between the main lens and the photosensitive surface, and to improve the light shielding plate of the auxiliary lens housing for the addition. Opening/closing of the camera, compensation of the aperture in response to changes in focal length due to the addition of an auxiliary lens, etc. can all be performed automatically by pressing a push button provided outside the camera. More specifically, the front plate that supports the main lens is supported by a swivel-like link that is biased in the forward direction with respect to the body, and in the case of only the main lens, this sash-like lever is restrained by a locking piece. This locking piece is linked to a push button on the outside of the camera.
When the push button is pressed, the locking piece is released, the lever is released, and the front plate is moved forward. Furthermore, in conjunction with the lever, there is a light-shielding plate that covers the housing part of the auxiliary lens formed inside the camera, which also serves as one side of the wall of the light-shielding tube, and when this light-shielding plate is pushed open, the auxiliary lens is exposed to the main lens. A compensating aperture ring that is added to the lens can be added to the lens to expand the shooting conditions by configuring a long focal length lens system for changes in focal length, and to compensate for changes in the aperture caused by changes in focal length. The aperture mechanism is converted by providing an aperture blade center pin and an aperture conversion pin, and each of these operations is automatically completed by operating the push button, making camera operations for focal length conversion extremely easy. Completely and quickly obtained.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings, which illustrate embodiments of the invention.

1 is the body of the camera; 2 is a front plate to which a main lens 3 is attached; and 4 is a back cover having a pressure plate 6 for pressing a photosensitive film 5 flatly.

A bellows 7 is provided between the body 1 and the front plate 2 to maintain light shielding properties when the front plate 2 moves.

A board 8 is fixed to the body 1 side, a board 9 is fixed to the front plate 2 side, and pivots 10, 10' on both sides of the board 8,
Pin 1 fitted into elongated holes 11, 11' of substrate 9
Lever 12, 12' is provided between 3, 13', and lever 12, 12' is provided between pivot shafts 14, 14' on both sides of base plate 9 and pin 13' in elongated hole 15, 15' of base plate 8.
6, 16' are the pins 17, 1 of the levers 16, 16'
7' is fitted into the elongated holes 15, 15',
These levers 12, 16 and 12', 16' are
They are pivotally connected by center pins 18 and 18', respectively, and are formed in an X-shaped sash shape. Additionally, springs 20, 20' are stretched between the pin 17 and the fixing pin 19 on one side of the board 8, and between the pin 17' and the fixing pin 19' on the other side of the board 8, so that the front plate 2 is moved forward. It is biased in the direction by levers 16 and 12 and levers 16' and 12'.

The hooks 22, 22' are pivotally connected to the fixing pins 19, 19' by springs 21, 21', and
14' and the locking pieces 23, 2 which are biased in the direction of engagement.
3', and engaging portions 24, 24' are locked at one end thereof, and the engaging portions 24, 24' have their centers pivoted to the body 1 side by a pivot 26 (FIG. 3). It is formed into a lever 25. Further, a push pin 27 operated by a push button (not shown) outside the body 1 is in contact with a part of the locking piece 23 .

Inside the body 1 is a multi-stage light shielding tube 28 (fourth
) is fixed, one side of which is removed, and a light-shielding plate 30 is pivotally attached to this part by a shaft 29 and is biased by a spring (not shown) in a direction to close the above-mentioned side. To position.

Also, below this light shielding plate 30, there is a hinge 3 on the front plate 2.
A support plate 35 for the auxiliary lens 34 is provided, which is pivotally mounted at 1 and biased by a spring 32 (FIG. 5) in a direction to protrude from the inside of the accommodating part 33.

A roller 36 (see FIG. 6 below) is rotatably provided on a part of the support plate 35, and this roller 36 is connected to a cam 37 fixed to one lever 12' of the swivel-shaped lever.
and are pressed together by the stored force of the spring 32.

A fixing pin 38 is installed on the substrate 8, and a long hole 39 is fitted into the fixing pin 38. The long hole 39 is a movable plate 43
This movable plate 43 is provided with a spring 42
The tip toe 41 and the inclined surface 40 are connected to the lever 1.
He is facing pin 17 of 6. Further, a movable pin 44 installed on a rotating plate 45 is also inserted through the elongated hole 39, and a portion of the movable pin 44 comes into contact with the light shielding plate 30.

A plate 46 is fixed to the front plate 2, and a sector gear 48 is pivotally connected to a shaft 47 provided on the front plate 2. One end of the sector gear 48 is in contact with the aforementioned pin 13'.
The teeth of No. 8 are pivotally connected to another sector gear 49 by a meshing shaft 50, and have a spring 51 engaged therewith, which urges the sector gear 49 clockwise in FIG. 2 and the sector gear 48 counterclockwise. are doing.

The aperture mechanism (see FIG. 7) includes an aperture ring 52 having an f-number, an aperture blade ring 53 interlocked with the aperture ring 52, and an aperture blade 56 that engages with a cam groove 54 provided in the ring 53 via a pin 55. (In order to simplify the drawing, one blade is not shown in the figure). A compensating aperture ring 58 having an aperture converting pin 57 that abuts on a part of the sector gear 49 described above is provided, and includes an abutment portion 60 that abuts on the interlocking rod 59 of the aperture ring 52 and an aperture blade 56. The provided center pin 62 is rotatably supported. Although not shown in the figure, the compensating aperture ring 58 is always given a rotational force in the counterclockwise direction in FIG. 7 by a spring or the like, and is provided with a stopper to prevent it from returning more than necessary.

Next, to explain the operation of the above configuration, the figure shows the case of normal photography using only the main lens 1, and the state shown by the dotted line in FIGS. 1 and 6 shows the case when the auxiliary lens 34 is used. . During normal photography, the auxiliary lens 34 is housed in the accommodating part 33, and the light shielding plate 30 covers this so that the auxiliary lens 34
This prevents the diffused reflection inside the light-shielding tube 28 due to the light-shielding tube 28, and allows good photographing to be performed like a general camera.

When the auxiliary lens 34 is added to the main lens 3 and used as a long focal length lens, when the aforementioned external push button (not shown) is pressed, the push pin 27 is pushed and the locking piece 23 is rotated around the fixing pin 19. Rotate clockwise (in Figure 1). Then, the engaging part 24 is lifted up, and the engaging part 24' on the opposite side is held up by the locking piece 2.
3' is rotated clockwise in FIG. 2 around the fixing pin 19'. The hooks 22, 22' thus open the pivots 14, 14' of the levers 16, 16'.

As a result of this opening, the pins 17, 17' move up inside the elongated holes 15, 15' due to the accumulated force of the springs 20, 20', and at the same time, the lever 1
The pins 13, 13' of 2, 12' are also elongated holes 11, 11'.
(The reference numeral 11 coincides with the elongated hole 63 provided in the plate 46 and is not shown in FIG. is sent forward as indicated by the one-dot broken line in FIG.

The pin 17 is raised by sliding on the inclined surface 40 of the movable plate 43 located within this trajectory, and the movable plate 43 is guided by the fixed pin 38 and the movable pin 44 in the elongated hole 39, and the spring 42 is expanded. The pin 17 passes by simply sliding the movable plate 43 away.

As is clear from FIG. 6, the rise of the pin 13' displaces the cam 37 attached to the lever 12' as the angle of the lever 12' changes, and the contact position of the roller 36 that is in pressure contact with it also changes. By doing so, the auxiliary lens 3 is inserted through the support plate 35 around the hinge 31.
4 is rotated by the stored force of the spring 32, and the light shielding plate 30 is rotated.
The auxiliary lens 34 is stably set on the rear surface of the front plate 2 so that it coincides with the optical axis of the main lens 1, as shown by the broken line in FIG. When the support plate 35 rotates, the light shielding plate 30 is pushed open around the shaft 29, and after the auxiliary lens 34 passes, it is returned to its original position by a spring (not shown), and the accommodating portion 33 is closed again, so that when the auxiliary lens 34 is used. Good photography is also done.

When the auxiliary lens 34 is used in this way, the focal length of the photographic lens becomes longer. Therefore, main lens 1
If the focal length N changes to the focal length T when the auxiliary lens 23 is added, then f
The number scales will no longer match. FIG. 8 shows a graph of the aperture diameters D _N and D _T of the lens for each f-number at N and T. In other words, for the maximum diameter A of D _N , in the case of D _T
A', and although a small amount of the difference α is narrowed down, looking at the f-number, in this case the f-number is about 4.5 compared to about 2.8, and this must be compensated for.
Therefore, as illustrated in FIG. 7, the aperture conversion pin 57 is engaged with the sector gear 49, and the aperture conversion pin 57 is actuated by rotation of this gear through a predetermined angle, and the compensation aperture ring 58, the contact portion 60, and the interlocking rod are operated. The aperture ring 52 is rotated through the aperture ring 59 to convert the f-number scale to a position of approximately 4.5, and below that the aperture ring 52 is locked to the abutting portion 60 and does not operate.
However, the curve D _N for the main lens 1 does not match the curve D _T for the long focal length, and for example, the f number is 8.
In the case of _DN, it is D _N ', and in the case of D _T , it is D _T '. As mentioned above, this caliber difference B is determined by the sector gear 4
9. Since the compensation aperture ring 58 is rotated by a predetermined angle via the aperture conversion pin 57, the aperture blades 5
The central pin 62, which is the center of rotation of the diaphragm 6, is also changed in its center position by a predetermined angle to compensate for the movement of the aperture blade 56 and perform an operation matching the curve _DT or _DN .

Furthermore, when returning from the long focal point to the case where only the main lens 1 is used, the front plate 2 is pressed toward the body 1. Then, the pin 17 also descends, and due to this descent, the toe 41 and the pin 17 engage with each other. For this purpose, the movable plate 43 is rotated counterclockwise around the fixed pin 38, and the rotating plate 45 is connected to this by a movable pin 44.
The light shielding plate 30 that is in contact with a part of the light shielding plate 30 is rotated around the axis 29 to open the housing part 33, and then the auxiliary lens 34 and the roller 36 are moved around the hinge 31 by the displacement of the cam 37. When the pin 17 and the toe 41 engage and disengage, the light shielding plate 30 is moved into the housing portion 3 by a spring.
Close 3. Also, at this time, the pivots 14, 14' are locked to the hooks 22, 22' of the locking pieces 23, 23',
The protrusion of the front plate 2 is secured and a part of the sector gear 48 is brought into contact with the lowering of the pin 13'.
clockwise, the sector gear 49 rotates counterclockwise to release the aperture converting pin 57, and the aperture diameter is returned to curve D _N in FIG. In other words, in Fig. 8, the f number of approximately 2.8 at point A is indicated by f number at point A'.
A number of approximately 4.5 is specified, but as the position of the center pin 62 changes, the aperture of the diaphragm blades 56 does not change beyond the difference in α shown in FIG. 8, and f-numbers larger than this cannot be used. Therefore, the aperture for a long focal point can be obtained by using the aperture scale of the main lens with a short focal length, and if the f-number is at F8, that is, D _N ', when changing to this long focal length, the f-number will change. The diameter is changed to D by the displacement of the center pin 62 without
_N ' will be made larger than D _T '.

In this way, in a camera with a built-in auxiliary lens, the auxiliary lens is operated in conjunction with the swivel-shaped lever device on the front plate that automatically compensates for any changes in the focal length of the lens by pressing the external push button and moves it forward. By doing so, the interlocking can be performed reliably, and the light-shielding plate can completely shield the light-shielding tube regardless of whether the auxiliary lens is used or not, making it possible to take clear photographs without diffused reflection of light passing through the lens. . Furthermore, since the lens aperture and f-number can be automatically compensated and changed from D _N to D _T in response to a change in focal length due to the addition of an auxiliary lens, exposure accuracy can be obtained.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a cutaway side view showing the inside of the right side of the camera, FIG. 2 is a cutaway side view showing the inside of the left side, and FIG.
A cutting plan view taken along the - line in the figure, the same line in Fig. 4, and the - line in Fig. 5, respectively;
FIG. 6 is a side view cut along the line of FIG. 5, FIG. 7 is an exploded perspective view of the diaphragm portion, and FIG. 8 is a graph showing changes in aperture with respect to f-number due to changes in focal length. Code: 1 is the body, 2 is the front plate, 3 is the main lens,
8, 9 are substrates, 10, 10', 14, 14', 26
is a pivot, 11, 11', 15, 15', 63 are long holes, 12, 12', 16, 16' are levers, 13,
13', 17, 17', 55 are pins, 18, 18'
is the center pin, 19, 19', 38 are the fixed pins, 2
3, 23' are locking pieces, 27 is a push pin, 28 is a light-shielding tube, 29, 47, 50 is a shaft, 30 is a light-shielding plate, 3
3 is a housing part, 34 is an auxiliary lens, 36 is a roller, 3
7 is a cam, 40 is an inclined surface, 41 is a toe, 43 is a movable plate, 44 is a movable pin, 45 is a rotating plate, 46 is a plate, 48 and 49 are sector gears, 52 is an aperture ring,
53 is an aperture blade ring, 56 is an aperture blade, 57 is an aperture conversion pin, 58 is a compensation aperture ring, 59 is an interlocking rod, 60 is a contact portion, and 62 is a center pin.

Claims (1)

[Claims] 1. In a camera that has a built-in auxiliary lens that is added to the main lens to change the focal length, the front plate to which the main lens is attached and a swivel-like lever between the front plate and the body are used to move the camera forward in the forward direction. A biased swivel-like lever is provided, and a locking piece that engages the swivel-like lever to hold the front plate in a retracted position within the body is provided, and an auxiliary lens is housed on one side of the light-shielding tube inside the camera. A light-shielding plate that forms a part and covers the housing part and also serves as one side of the light-shielding tube is pivotally mounted so as to open and close in conjunction with the opening and closing of the swivel-shaped lever, and also in conjunction with the opening and closing of the said opening and closing and with the aperture ring of the main lens. The compensating aperture ring is provided with a center pin that serves as a center of rotation of the aperture blades, and a push pin that can be operated from the outside of the camera abuts a part of the locking piece. When the push pin is pressed, the locking piece disengages the swivel-like lever, and when the swivel-like lever is released, the front plate moves forward, the light shielding plate opens and closes the container, and the auxiliary A camera with a built-in auxiliary lens, characterized in that compensation of the aperture value is automatically set by rotating the lens into the optical axis of the main lens and rotating the compensation aperture ring.