JPS6140973B2 - - Google Patents

Description

[Detailed description of the invention] The present invention fixes the main lens on the photography optical axis,
A separate auxiliary lens is always built into the camera so that the focal length of the main lens can be changed to take pictures, and the camera also has a separate auxiliary lens that corresponds to changes in the setting position with respect to the photoresist film surface of the main lens due to changes in focus. This relates to the aperture of a camera in which the auxiliary lens is located on the optical axis of the main lens or off the optical axis. It is characterized in that it can compensate for changes in value, and that this action is automatically performed in conjunction with the operation of the auxiliary lens.

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.

First, to explain an example of the operation of the auxiliary lens, 1 is the camera body, 2 is the front plate to which the main lens 3 is attached, and 4 is the photosensitive film 5.
This is a back cover that has a pressure plate 6 that presses it flat. A bellows 7 is provided between the body 1 and the front plate 2, and the front plate 2
Maintains light blocking properties during movement.

Boards 8 and 9 are fixed to the body 1 side and the front plate 2 side, respectively, and pivots 10 and 1 are fixed to both sides of the board 8.
0' and the long holes 11 and 11' of the board 9, the lever 1
2, 12' are the pins 13, 1 of the levers 12, 12'
3' is provided by fitting into the long holes 11, 11',
Further, levers 16, 16' are provided between the pivot shafts 14, 14' on both sides of the board 9 and the long holes 15, 15' of the board 8, and the pins 17, 17' of the levers 16, 16' are connected to the long holes 15, 15'.
These levers 12, 16 and 12', 16' are pivotally connected by center pins 18, 18', respectively, and are formed into an X-shaped swivel. Note that the pin 17 and the fixing pin 1 on one side of the board 8
Similarly to 9, springs 20, 20' are stretched between the pin 17' and the fixing pin 19' on the other side of the board 8.

The fixing pins 19, 19' are provided with locking pieces 23, 23', which are urged by springs 21, 21' in the direction in which the hook portions 22, 22' engage with the pivots 14, 14', and the locking pieces 23, 23' are provided at one end of the locking pieces 23, 23'. A lever 25 having joint portions 24, 24' is pivotally attached at its center to the body 1 side by a pivot 26 (FIG. 3). Also, in contact with a part of the locking piece 23,
A release pin 27 operated by a push button (not shown) outside the body 1 is in contact with the release pin 27 .

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 part of the support plate 35 is rotatably provided with a roller 36 (see FIG. 6 below), which 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 the rotary 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 provided pivotally connected to a shaft 47 provided on the plate 46.
One end thereof is a long hole 63 formed in the plate 46 in the same manner as the long hole 11' (overlapping state in FIG. 2).
The teeth of the sector gear 48 are in contact with the aforementioned pin 13' passing through the sector gear 49, and the teeth of the sector gear 48 are pivotally connected to another sector gear 49 by a shaft 50 on the meshing plate 46, and have a spring 51 latched thereto. is biased clockwise in FIG. 2, and the sector gear 48 is biased counterclockwise.

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. A central pin 62 provided is supported. Although not shown in FIG. 7, the compensating aperture ring 58 is biased counterclockwise by a spring 61 as shown in FIG. 9. Further, 64 is a stopper that regulates the aperture aperture to be at its maximum position when only the main lens 3 is used.

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 dashed line in FIGS. 1 and 6 shows when the auxiliary lens 34 is opened. . 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 release pin 27 is pushed and the locking piece 23 is moved around the fixed pin 19. Rotate counterclockwise. (In Fig. 1) Then, the engaging part 24 is lifted up, and the engaging part 24' on the opposite side is attached to the locking piece 2.
3' is rotated clockwise in FIG. 2 around the fixing pin 19'. The hooks 22, 22' thus release the pivots 14, 14' of the levers 16, 16'. As a result of this release, the pins 17, 17' rise within the elongated holes 15, 15' due to the accumulated force of the springs 20, 20', and at the same time, the levers 12, 1
2' pins 13, 13' are also elongated holes 11, 11' (1
1' corresponds to the elongated hole 63 provided in the plate 46 and the second
Not shown in the figure. ), the front plate 2 is sent forward as shown by the one-dot broken line in Figure 1.
Light is kept between the front plate 2 and the main body 1 by the bellows 7. The pin 17 is raised by sliding on the inclined surface 40 of the movable plate 43 located within this locus, and moving the movable plate 43 horizontally through the elongated hole 39 with the fixed pin 38 and the movable pin 44 as guides. It extends and simply slides out to pass.

Furthermore, 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. As a result, the auxiliary lens 34 is rotated by the stored force of the spring 32 through the support plate 35 around the hinge 31, so that the auxiliary lens 34 is aligned with the optical axis of the main ring 1 as shown by the broken line in FIG. It is stably added to the rear surface of 2.
Note that during this rotation of the support plate 35, the light shielding plate 30 is pushed open around the shaft 29, and after the auxiliary lens 34 passes, it is pushed back into the housing part 3 by a spring or the like (not shown).
3 is closed.

When the auxiliary lens 34 is used in this way, the focal length of the photographic lens becomes longer. Therefore, if the focal length of the main lens 1 is N, and the focal length changes to T when the auxiliary lens 23 is added, then by T/N,
In the opposite case, the f-number scale will not match unless the aperture diameter is changed by N/T. So this N
A graph of the aperture diameters D _N and D _T of the lens for each f number at T and T is shown in FIG. In other words, the maximum diameter A _{of D}
Looking at the f-number in this case, the f-number is about 2.8, but it is about 4.5, and unless this is compensated, the f-number of the main lens 3 cannot be used. Therefore, as illustrated in FIGS. 7 and 9, only the aperture α is actuated by rotation of the sector gear 49, which partially contacts the aperture conversion pin 57. That is, in FIG. 9, the sector gear 49 is the aperture conversion pin 57.
The compensating aperture ring 58 is engaged with the compensating aperture ring 58, and the aperture ring 52 is rotated until the f-number scale indicates approximately 4.5. However, the conventional aperture blade 56
When the center pin of the diaphragm does not move, the aperture blades 56 are narrowed down by an amount corresponding to about 4.5, but in the present invention, the position of the center pin 62 changes with the rotation of the compensation aperture ring 58, so the aperture blades 56 are From point A to point A' in the figure, the aperture aperture corresponding to the longer focal length is indicated on the f-number, and the aperture is made impossible by the abutting portion 60.

Furthermore, when the f-number position of the aperture ring 52 is at a position such as f8 in FIG. Since there is no engagement between the aperture and the contact portion 60, only the aperture diameter difference α' is corrected while the f number remains the same.

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. The pin 17 then first engages the toe 41 to begin its descent. For this purpose, the movable plate 43 is attached to the fixed pin 38.
Since the rotating plate 45 connected to the rotating plate 45 also rotates, the light shielding plate 30 that is in contact with the light shielding plate 30 is rotated around the axis 29 to open the housing portion 33. Then, due to the displacement of the cam 37, the auxiliary lens 34 and the roller 36 are housed in the housing part 33 around the hinge 31, and when the pin 17 and the toe 41 engage and disengage, the light shielding plate 30 is moved by the spring 44 into the housing part 33. Close. Also, at this time, the pivots 14, 14' are locked to the hook portions 22, 22' of the locking pieces 23, 23', thereby locking and securing the protrusion of the front plate 2. Further, the sector gear 48 rotates clockwise as the pin 13' descends, and the sector gear 49 rotates counterclockwise to release the aperture conversion pin 57, and the aperture diameter is returned to the curve D _N in FIG.

In this way, in a camera with a built-in auxiliary lens, by operating the auxiliary lens in conjunction with the swivel-shaped lever device on the front plate that is sent forward, the lens aperture and f-number can be adjusted in response to changes in focal length due to the addition of the auxiliary lens. Since D N can be automatically compensated for and changed from D _N to D _T , 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;
Figure 6 is a cutaway side view along the line shown in Figure 5, Figure 7 is an exploded perspective view of the aperture section, Figure 8 is a graph showing changes in aperture versus f-number due to changes in focal length, and Figure 9 is a compensation aperture ring. Front view of the part,
It is. Code: 1 is the body, 2 is the front plate, 3 is the main lens,
34 is an auxiliary lens, 48 and 49 are sector gears, and 52
is the aperture ring, 56 is the aperture blade, 57 is the aperture conversion pin, 58 is the compensation aperture ring, 59 is the interlocking rod, 6
0 is a contact portion, and 62 is a center pin.

Claims (1)

[Claims] 1. In a camera aperture device in which an auxiliary lens is built into the camera and is selectively added to the main lens to change the focal length, an aperture conversion pin that is linked to the operation accompanying the addition of the auxiliary lens, and a diaphragm conversion pin for the main lens. The compensation aperture ring has a contact portion connected to an aperture ring having an aperture scale through an interlocking rod, and the compensation aperture ring is provided with a center pin for rotating the aperture blades, and the center pin is connected to the compensation aperture. An automatic aperture compensation device for a camera with a built-in auxiliary lens, characterized in that the aperture aperture in the case of a change in focal length is adapted to the aperture scale of the main lens by changing its position by rotating a ring.