JPS60205409A - Automatic focus adjusting adapter for interchangeable lens - Google Patents

Abstract

PURPOSE:To make it possible for an automatic focus adjusting adapter for an interchangeable lens to function as an ordinary teleconverter by providing an external operating means to said adapter so that a conversion lens is made movable manually. CONSTITUTION:An interchangeable lens 2 is mounted to a camera body 3 mounted with an adapter 1 after the distance ring 2a of the lens 2 is set in an infinite position. An operating dial 64 is made operatable through a hole 50a opened on the side face of a driving part 1b on the side opposite from a focus lock button 51. The rotation thereof is transmitted to a gear 58 consisting of integrally rotating gears 58a and 58b, a gear 59, a gear 25 and a focus gear 26 via clutches 66a, 66b to move the lens in the optical axis direction so that infinite setting of the lens is made possible. The position of the conversion lens is known from the outside by attaching an index and scale to the gear 26 and providing an index reading window to the casing 50.

Description

[Detailed description of the invention]

(Technical Field of the Invention) The present invention relates to an automatic focusing adapter, particularly a conversion lens driven for focusing.
This invention relates to an autofocus section 111 attacher provided between the lens and the camera body. (Background of the Invention) This multiple device is disclosed in Japanese Patent Laid-Open Publication No. 58-368023 filed by one person. The automatic focus adjustment adapter disclosed in this publication (hereinafter referred to as
The adapter (referred to as an adapter) consists of a conversion lens, a motor that moves the lens in the optical axis direction, a focus adjustment control device that drives and controls the motor, an arithmetic device that outputs a lens signal of the interchangeable lens to the device, and a conversion lens. It consists of a light receiving device that detects the amount of movement of the lens, etc. The focus adjustment control device of this adapter rotates the motor in the focusing direction based on image plane shift information sent from the focus detection device on the camera body side and a detection signal that varies in the direction of the shift. As the motor rotates, the conversion lens moves in the optical axis direction, and the amount of movement is converted from the light receiving device into a pulse signal and fed back to the arithmetic device. In addition, at least the focal length information of the interchangeable lens and the lens signal, which differs depending on the lens, is transmitted through the terminal of the afterter. I can input data into the device. This lens No. 16 and Mf
Lens transfer from J! 11 The movement of the conversion nose relative to the installed Y conversion lens from the two signals with the quantity signal ■
The amount of movement of the edge surface corresponding to Δd is calculated by the calculation device. The performance--the result is the correction.
Therefore, the focus adjustment control device +C- compares the detected image shift meter with the focus detection device 2 and the focus adjustment control device +C-, and when they are equal, the focus adjustment control device stops the motor. Therefore, the conversion lens stops at that position and the focal point 614 is completed. However, with the adapter described above, the conversion lens moves in the optical axis direction for focus adjustment.
5! It is stopped when the L-wave object image is focused, and the focus is 1j7J.
flij was completed, but in that case, since the position of the conversion lens after the completion of focus adjustment was unspecified (other than the position at infinity), a normal teleconverter (i.e., when the adapter is at infinity, the continuous layer When used as a teleconverter (optically equivalent to a teleconverter), there was the inconvenience that the bin 14 could not be set at infinity even if the focusing ring was used to change the focusing ring. (Objectives of the Invention) It is an object of the present invention to provide an automatic focusing adapter for interchangeable lenses that overcomes all of these drawbacks and also functions as a normal teleconverter. (Summary of the Invention) The present invention provides an automatic focusing adapter for an interchangeable lens with an external operation means to enable manual movement of the conversion lens, and is configured to also function as a normal teleconverter. are the technical points. (Example) Figures 1 to 4 show an example of the present invention, and Figure 1 shows an automatic focus adjustment adapter for interchangeable lenses (hereinafter referred to as an adapter) for a camera equipped with an interchangeable lens and a focus detection mechanism. Side view when installed between the body? 2 shows a sectional view of the adapter, FIG. 3 shows a perspective view of the lens drive system of the adapter, and FIG. 4 shows an explanatory diagram of the clutch mechanism of the adapter. Generally, the distance ring (2a) of the interchangeable lens (2) shown in Fig. 1 is set at the infinity (ω) position, and the interchangeable lens (2)' is attached to the camera body (3) on which the attachment (1) is attached. . This adapter (1) is composed of a conversion lens and its drive 1ts (Ib), and the drive unit (]b of the adapter (1)) The drive mechanism operates to automatically drive the conversion lens and perform focus alignment. The detailed configuration of this adapter (1) will be described later. The distance ring (2a) of the interchangeable lens (2) should generally be set at infinity, but if the shooting distance is very close or the interchangeable lens (2) to be attached is a long focal length, it may be set at infinity (CX Since the movement needle of the image plane from )) to the closest point is large, it may not be possible to cover it only by moving the conversion lens in the trap or adapter (]), that is, focusing may not be possible. In this case, the distance ring (2a) of the interchangeable lens (2) should be moved from the i-infinity (ω) position to the closest position, and the adapter (1)
As a result, the range where the tips fit shifts to the close side, making it possible to focus. The drive portion (1b) of the adapter (J) is located below the conoversion lens and protrudes toward the side where the interchangeable lens (2) is attached. The focus lock button (5J) is arranged on the side of the part of the drive unit (]b) that protrudes toward the interchangeable lens (2). When the button (51) i is pressed, the drive mechanism is forcibly stopped and the conversion is stopped. You can temporarily stop the lens. Focus lock button (sJ)k like this
Place the adapter (1) between the fully interchangeable lens (2) and the camera body (3) so that the claw lock button (5J) is at an appropriate distance from the camera body (3) (i.e. , is placed at a distance from the front of the camera body (3) to the bottom of the adapter (1) (at a distance that allows three or four fingers of the supporting left hand to be placed) to provide good operability when holding the camera. It is. An operation dial (64), which will be described later, can be operated from a hole (50a) formed in the side surface of the drive unit (lb) on the opposite side to the focus lock button (5J). The internal structure of the adapter (1) will be explained using FIG. 2. Ball race (18) is mounted on the camera side
(10), presser foot (37), open F value interlocking lever (]4
) to allow the open F-number interlocking lever (14) to rotate smoothly and accurately, and is comprised of a plurality of poles. In addition, the ball race (19) is interposed between the presser mounds (37), (38) and the automatic aperture interlocking lever (16) to open the automatic aperture interlocking lever (16).
6) is made to rotate smoothly and accurately, and is composed of a plurality of balls. The drive unit (20a) is attached to a fixing plate (22) fixed to a fixing member (21) with a screw (24) via a vibration isolating rubber (23).
] to prevent the vibration of the drive unit (20a) from being directly transmitted to the lens barrel and causing noise. In addition, since the fixing plate + 22) is a separate member from the Vi fixing member (21), it is possible to adjust the distance between the axes of the output gear (25) and focus gear (26) and fix them. . The drive unit (20a) includes a motor, a reduction gear train, and an electric circuit that controls the entire drive system.
It is composed of a pulse generator that generates pulses proportional to the amount of movement of the conversion lenses (8a) to (8e), a pulse detector that detects the number of pulses, and the like. The electric circuit (20b) constitutes a part or all of the electric circuit of the unit (20a). The rotation of the focus gear (26) is controlled by a lever (27) fixed to the focus gear (26).
The helicoid ring (30) was fixed to the helicoid 11 (30), and the helicoid ring (30) was fixed to the helicoid ring (30). The c-plane rotates. Helicoid 1Jit30) and mfll (39
) and are engaged by helicoid screws, so helicoid 3! When (30) is rotated, it translates along the lens barrel (39) in the optical axis direction. Since the lens chamber (3j) is fixed to the helicoid fjl (30), the lens chamber (31) also moves in the optical axis direction, and the lenses (8a) to (8e) fixed thereto also move along the optical axis. move in the direction. The washer (33) is a helicoid! (30) and the lens chamber (31).
The positions of a) to (8e) can be adjusted.做(3
4) completely prevents the helicoid screw part of the lens barrel (39) from being seen from the outside when the lenses (8a) to (8e) move to the right in the figure, and also prevents dust etc. from being seen on the helicoid screw part. This completely prevents the adhesion of particles from causing problems in driving the lenses (8a) to (8e). Lens (8a) ~ (8
e) The limit position of the drive range (ω side to close side) c, the brush (32) and mirror added to the focus gear (26) @
It is determined by an electrical output signal from an electrode pattern (41) fixed to (39), and is configured to stop or reverse at its limit position. The switch (36) is an off/off switch for the power supply of the electric path system of the drive unit (2oaJ and (2ob)), and can be turned on/off by sliding it from the outside and using the IC.Adapter (1) t- When used by attaching it between the conversion lens (2) and the camera body (3) with a built-in focus detection mechanism, the detection signal of the focus detection mechanism is transmitted to the lenses (8a) to (8e).
The drive unit (2) is connected to the camera body (1) (not shown) provided on the protection ring (13) of
0a) and (20b) to automatically adjust the lens (8a)
) to (8e) can be driven to perform focus alignment. This contact bin (not shown) is an electrical contact point for exchanging various signals with the camera body (3) and receiving power supply from the camera body (3). And in that case, the lens

[
According to 8a] to (8e), the photographing magnification is the sum of the magnification of the interchangeable lens (2) alone and the total loss of the specific magnification.Second
As can be seen from the figure, by arranging the lenses (8a) to (8e) to the right with respect to the mount surface of the K-cross m lens mount (6), there is plenty of space between the lens (8a) and the mount surface. ? It is possible to increase the number of fjIt types of interchangeable lenses that can be attached, and the adapter (1) can be made highly versatile. Next, the internal structure and operation of the drive unit (20a) will be explained in detail using FIG. The casing (50) is a case for the drive unit (Jb), and has a hole t5oa> open so that the operation dial (64) can be operated from the outside.The drive unit (# in the casing (50) is The focus detector on the camera side (the motor (
52) is started, its rotation is transferred to the gear train (53), (
54aJ, (54cJ. (57a), +57b), (58a), (58b). (59) and (25)', the signal is transmitted to the focus gear (26) while being decelerated. This gear train has a fixed plate (62
) and (63) are arranged as a unit and fixed inside the casing (50). The gear (53) is
The output shaft pressure of the motor (52) is provided, and the gear (54B)
[The rotation of the motor (52) is transmitted. Gear (Sa
a) and (S4C) are supported by the shaft (6Qa) and rotate integrally, transmitting the entire rotation to the gear (57aJ). The shaft is supported by the shaft and rotates as a unit, and the entire rotation is transmitted to the gear (ssaJ). , the entire K rotation is transmitted to the gear (59).The gear (59) rotates while being supported by the shaft (6OC), and is transmitted to the gear (25) which is supported by the shaft (t60d) K, and is finally decelerated. Rotating focus gear (26
) K is transmitted. When the focus gear (26) rotates, its E rotation is transmitted to the helicoid fi (30), the lens barrel (39), and the lens chamber (31) as described above, and the lenses (8a) to 3 are rotated in the optical axis direction.
(8@) t-move. At that time, gear (s4a) V
C Multiple holes (54b) drilled at regular intervals and the holes (
54b) Photodiode (55) placed between i
, a phototransistor (56) detects the amount of movement of the lenses (8a) to (8C), and inputs the amount of movement of the lens to a focus adjustment control device (not shown) in the adapter (1). . Then, the image plane deviation detected by the focus detection mechanism on the camera side and the amount of lens movement are compared in the focus adjustment control device on the camera side, and when they become equal, the motor (52) is stopped. In addition, gear (5
A pulse detection device consisting of a 4aJ hole (s4bJ), a photodiode (55), and a phototransistor (56) is a conventional pulse detection device (Japanese Unexamined Patent Publication No. 58-1988-J68023) in which bright and dark areas with different reflectances are arranged at equal intervals on a disk. Compared to the detection device that irradiates light and detects the reflected light, the setup is #1, which provides a higher S/N ratio, and also a hole +54bJ in the first gear of the deceleration near the output shaft of the motor (52). This has advantages such as improving the stopping characteristics of the drive system since the rotational inertia of the gear train can be reduced compared to a trap provided with a casing. (Can be operated from 50aJ. Operation dial <64
)k When the rotation source is turned on, the rotation is caused by the clutch ((i6a),
(66b) is transmitted to C58a) and +58b) which rotate integrally with K1, gear (59), gear (25), and claw gear (26), and as described above, the lens (8a) to
C8m) The ligature can be moved in the C-axis direction and set to infinity. At that time, the position of the lens (8aJ to (8o)fflJ) is as follows: If the index and scale purple are attached to the claw gear (26), the index IC hole and nine windows are installed on the casing (50), etc. You can easily know the position from the outside. 68c), the L lever (68) can be moved along the guide bin (70) in the left-right direction in Figure K. Therefore, by sliding the power switch (36)', the lever (
68) to the left in the figure, the end (6ob
) is in contact with the switch contacts (69a) and (69b) to supply power to the circuit of the adapter <1), and the lever (68
) in the right direction, the switch contact piece (69a
) and (69b) are separated to cut off power supply to the circuit of adapter (1). What is the operation of the operation dial (64), lever (68), clutch mechanism, etc. in Figure 3 as shown in Figure 4? explain. The operation dial (64) is formed with a hole (64a) having a keyway, and a shaft (65) is fitted into the hole (64a) so as to be slidable in the Jl! direction.The tip of the shaft (65) A clutch plate (65b) is fixed to the shaft (65), and a key (fi5b) is formed on the other end VC of the shaft (65), and the key (6sb) is connected to the dial (64) as described above.
The hole C64 &) VC is fitted. A disk (65a) is fixed near the center of the shaft (65), and the disk +6Sa
) and a plate (72) fixed inside the casing (50)
A biasing spring (71) is provided between the two. Also,
The lever (68) is formed with an inclined portion (68a) that slides on the disc (65a).
36) (shown in Figure 2) to ON 1llll, the connection 511S (67)" (through lever (6B)
is slid to the left in Fig. 3 and downward in Fig. 4, and the inclined portion ((: 8 a) of the lever (68) is biased to the left in Fig. 4 by the biasing spring (71). disk(
fi5a) to the right to release the clutch (65) on the shaft (65).
Disconnect f+ 6 bJ from the gear train side clutch (61'ia). Therefore, the retrosource is turned on and the motor (
52] is activated and the autofocus is activated, the rotation from the gear train that is the drive system is not activated by the operation dial (64) for manual operation.
] side. Furthermore, when the conversion lens is driven by the motor (52),
Even if the operation dial (64) is operated inadvertently, the drive of the motor and gear train will not be interrupted, making it possible to prevent erroneous operations and protect the drive mechanism. Furthermore, when the power switch (36) is slid to the t-off side, the lever (68) is slid to the right in FIG. 3 and upward in FIG. (like the lever (68)), the inclined part (68)
8a) is retracted and the disc is +65 a) is the biasing spring (7I)
The clutch (6) of the shaft (65) is
6b) Connect with the clutch (66a) on the entire gear train side. Therefore, the power source is turned off and the operating dial (64) for manual operation is connected to the gear train, so that the operating dial (64) can be moved to the VCLD conversion range xr. (Effects of the Invention) As described above, according to the present invention, by providing an external operation means to the automatic focusing adapter for a conversion lens, the conversion lens can be manually moved. Became iJ Noh,
It has also become possible to use just one function as a normal teleconverter. In addition, even if you attach it to a camera body that does not have a focus detection mechanism, it will only work as a teleconverter.
It can be used as Historically, it has been possible to position the conversion lens in the focal plane direction by modifying external operation means, so it is possible to set the scale at or near the distance ring 'kAt' of the interchangeable lens. Close-up shots will also be able to focus at short distances, and can be expected to work as an adapter for close-up shots.

[Brief explanation of drawings]

Figures 1 to 4 □□□ show one embodiment of the present invention, and Figure 1 shows a 1144K automatic focus adjustment adapter for interchangeable lenses with a gold interchangeable lens and a camera body with a built-in focus detection mechanism.
Shows a side view when installed, and Figure 2 is a cross-sectional view of the adapter? 3 shows a perspective view of the lens drive system of the adapter, and FIG. 4 shows an explanatory diagram of the clutch mechanism of the adapter. (Explanation of symbols of main parts) ・・・・・・・・・River・・・・・・・・・・・・
Adapter 50・・・・・・・・・・・・・・・
・・・・・・ Casing 64・・・・・・Instep・・・・
...River... Operation tires 66a, 66b...
・・・・Clutch 67・・・・・・・・・・・・・・・
...Yuyu Connecting part 68...A...Mountain...L/bar departure person Nippon Kogaku Co., Ltd. agent Takashi Kannabe Figure 1 Figure 2) Figure 4

Claims (1)

[Claims] J. In an automatic focusing adapter for an interchangeable lens, which has a conoversion lens movable in the optical axis direction and a lens driving means that moves the conversion lens 1 in response to a focus detection signal, the conoversion lens is manually moved. An automatic focus adjustment adapter for an interchangeable lens, characterized in that it is provided with an external operation means for adjusting the focus.