JP3532025B2 - Camera drive - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for driving a camera element such as a taking lens of a camera and a sector for opening and closing a shutter opening. 2. Description of the Related Art Conventionally, camera elements such as a photographing lens and a shutter of a camera are driven by a motor. As shown in FIGS. 4 to 6, the structure is a donut-shaped base member a having a shutter opening at the center.
A lens barrel holding portion b is integrally provided around the opening,
A motor housing c composed of an upper plate and a lower plate is fixed to the lens barrel holding portion b. A spiral female screw is formed on the inner peripheral surface of the lens barrel holding portion b, and a spiral male screw formed at the rear end of the lens barrel d is screwed. The motor includes a rotor e composed of a permanent magnet rotatably supported,
A pair of substantially U-shaped stators f facing each other around the rotor e and magnetically coupled to the rotor, a bobbin g respectively fitted to one leg of the stator, and a stator wound around the bobbin. each coil h that excites f
And is constituted by. Terminals i and j for connecting wires drawn from both ends of the coil h are formed on one of the flanges of the bobbin g. Both terminals i and j protrude outward from a hole provided in the upper plate of the housing c, penetrate and protrude through a circuit board k provided on the outer surface of the upper plate, and are electrically connected to a pattern on the board by solder m or the like. Conducted. However, in the above conventional example, terminals i and j for connecting lead wires from both ends of the coil h are formed on one of the flanges of the bobbin g. i and j are respectively located on the outer peripheral side and one on the inner peripheral side of the donut-shaped base member a. For this purpose, as shown in FIG. 5, the lens barrel d with respect to the outer diameter D of the device.
If the ratio of the inner diameter d0 cannot be increased, and if the lens diameter is to be increased, the outer diameter of the apparatus must be commensurate with it. Further, as shown in FIG. 6, since the solder m is arranged in the width direction of the circuit board k, if the lens diameter is to be increased while keeping the outer shape of the shutter, the width of the donut-shaped base member and the circuit board are also narrowed and the pattern is drawn. It becomes difficult. As a result, there has been a problem that the lens diameter is reduced correspondingly in order to reduce the size of the apparatus. [0004] In order to solve the above-mentioned problems, the present invention provides two terminals for connecting both ends of a coil, one for each of both flange portions of a bobbin. And it is arranged near the outer periphery of the device. By arranging both terminals at such a position, a taper portion overlapping the central mechanism portion can be provided on the inner peripheral portion of the unit case containing the motor, and the center with respect to the outer diameter of the device can be provided. The ratio of the diameter of the deviation mechanism can be increased. This makes it possible to achieve both compactness of the apparatus and enlargement of the lens diameter at the same time. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a lens barrel according to the present invention.
Motor that drives the lens barrel and a unit that contains this motor
A camera driving device having a knit case and driving camera elements such as a shutter and a lens. The feature is that the motor is a rotor, a pair of stators facing each other around the rotor, a bobbin fitted to one leg of the stator, and the stator wound around the bobbin. Terminals for connecting lead wires drawn out from both ends of each of the coils are separately formed on both flange portions of the bobbin around which the coils are wound. Both the terminals are provided near the outer periphery of the device, and the unit case is donut-shaped, and a tapered portion is provided on the inner periphery thereof, and the lens is a mechanism portion closer to the center of the device. The outer peripheral part of the lens holding part at the front end of the lens barrel is expanded along the tapered part
And the inner peripheral part of the unit case and the
So that the outer periphery of the
It is . As described above, in the above-described unit case, in a camera driving device in which a tapered portion is formed in an inner peripheral portion overlapping with a centered mechanism portion, a centered mechanism portion with respect to an outer diameter of the device, for example, a lens barrel. The ratio of the diameter can be increased. An embodiment will be described with reference to the drawings.
1 and 2, a shutter base member 1 (not shown) has a circular outer shape, and is provided with a shutter opening 1a at the center thereof to have a donut shape. A lens barrel holding portion 1b is integrally provided around the opening 1a. A female spiral screw 1c is formed on the inner peripheral surface of the lens barrel holder 1b. At the center of the base member 1, a lens barrel 2 is disposed as a centered mechanism. A male helical screw 2a is formed at the rear end of the lens barrel 2, and is screwed into the helical screw 1c of the lens barrel holder. The front end of the lens barrel 2 serves as a lens holder 2b for a lens (not shown). A motor 3 for rotating and driving the shutter and the lens barrel 2 is formed in a donut-shaped unit case 4, which is fixed to the front end of the lens barrel holder 1b. The motor 3 is a motor that is driven to rotate forward and reverse, and includes a rotor 5 composed of a permanent magnet rotatably supported and a pair of substantially U-shaped members facing each other around the rotor 5 and magnetically coupled to the rotor. Stators 6 and 7 and bobbins 8 and 9 respectively fitted to one leg of the stator.
And coils 10 and 11 wound around the bobbin to excite the stators 6 and 7, respectively. Both flanges 8a, 8 of bobbins 8, 9
b and 9a and 9b are connected to terminals 12a and 12a for connecting lead wires drawn from both ends of the coils 10 and 11, respectively.
12b and 13a, 13b are formed respectively. The terminals 12a, 12b and 13a, 13b are all provided near the outer periphery of the device. These terminals protrude outward from holes 4a provided in the upper plate of the unit case 4. A circuit board 14 is provided on the front surface of the upper plate,
Each of the terminals protrudes through the board and is electrically connected to a wiring pattern on the circuit board 14 by a solder 15 or the like. Between the upper plate and the lower plate of the unit case 4,
Although not shown, another motor substantially the same as the motor 3 described above is incorporated, whereby two sets of motors are configured as the motor unit 4. Therefore, one of the motors is used to drive the lens forward and backward, and the other is used to open and close the shutter. FIG. 3 shows a pattern on the circuit board 14. Six patterns p drawn from a control circuit (not shown) are routed on the circuit board 14, and four patterns p It is electrically connected to the coil by the solder 15. At the bottom of the figure, solder 16 for conducting to other motors and switches (not shown) is provided in the remaining two patterns. As explained above, the terminals 12a, 12a
Since b, 13a, and 13b are all disposed near the outer periphery of the device, there is no restriction on the layout of the pattern as shown in FIG. 3 as shown in FIG. 3, so that a space is formed on the circuit board 14, and the width of the circuit board 14 is increased. W1 can be made smaller than the width W of the circuit board k shown in FIG. The space above the inner peripheral portion of the unit case 4 is a space. Therefore, a tapered portion 4b is provided in the inner peripheral portion of the unit case 4, and the diameter of the lens holding portion 2b at the front end of the lens barrel 2, which is a mechanism portion near the center of the device, is set to be larger than that of the unit case 4 at the same level. Large diameter. That is, the outer peripheral wall portion of the lens holding portion 2b is formed so as to expand along the tapered portion 4b, so that the inner peripheral portion of the unit case 4 and the outer peripheral portion of the lens barrel 2 overlap. It is configured in. Therefore, when the outer diameter of the apparatus is the same as the conventional outer diameter D of FIG. 5, the inner diameter D1 of the lens holding portion 2b becomes larger than the conventional inner diameter d0. That is, the inner diameter D with respect to the outer diameter D
The ratio of 1 is larger than the conventional case shown in FIG.
In the case of a camera having the same outer diameter, a lens having a large diameter, that is, a bright lens can be used. The central shaft 5a of the rotor 5 projects rearward from the lower plate of the unit case 4, and a rotor pin (not shown) is fixed to the projected end. Through this rotor pinion and a transmission mechanism (not shown), the lens barrel 2 is rotated by the rotational force of the motor to move the lens forward and backward, and the rotational force of the other motor is transmitted to open and close the shutter. In this embodiment, the lens drive and the opening and closing of the shutter are performed by different motors, but these can be performed by a single motor. Further, a motor that only drives the shutter may be used. The present invention is embodied in the form described above, and has the following effects. Providing the coil terminals separately on both the flange portions of the bobbin is advantageous for the layout of the pattern on the circuit board and makes it possible to reduce the width of the circuit board. And,
By providing both terminals on the outside, it is possible to provide a tapered portion that overlaps the central mechanism portion on the inner peripheral portion of the unit case that houses the motor, so that the diameter of the central mechanism portion relative to the outer diameter of the device can be reduced. The ratio can be increased. As a result, the camera can be made compact, and a lens having a larger diameter than the outer diameter can be used. Therefore, a brighter lens can be used and the demand of the consumer can be satisfied.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of an embodiment in which a lens barrel is omitted. FIG. 2 is a sectional view of a main part. FIG. 3 is a pattern diagram of a circuit board according to an embodiment. FIG. 4 is a plan view omitting a lens barrel of a conventional example. FIG. 5 is a sectional view of the same. FIG. 6 is a pattern diagram of a conventional circuit board. [Description of Signs] 3 Motor 4 Unit case 4b Tapered portion 8, 9 Bobbin 8a, 8b, 9a, 9b Collar portion 10, 11 of bobbin Coil 12a, 12b, 13a, 13b Terminal

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G03B 9/00-9/54

Claims (1)

(57) [Claims] [Claim 1] A lens barrel and a lens barrel driving the lens barrel
Motor and a unit case incorporating this motor
A camera driving device for driving a camera element such as a shutter or a lens , wherein the motor includes a rotor, a pair of stators facing each other around the rotor, and one leg of the stator. It comprises a bobbin to be fitted, and respective coils wound around the bobbin to excite the stator, and both flange portions of the bobbin for winding the coil include:
Terminals for connecting lead wires drawn from both ends of each of the coils are separately formed, both of the terminals are provided near the outer periphery of the device, and the unit case has a donut shape. , a tapered portion provided in the inner peripheral portion thereof, closer to the center mechanism portion der of the device
That the outer peripheral portion of the lens holding portion of the front end of the lens barrel, the
Expand it along the tapered part and form
The inner circumference of the case and the outer circumference of the lens holding
A camera driving device characterized in that it is configured to overlap .