JPH06174997A - Lens barrel - Google Patents

Abstract

PURPOSE:To provide a lens barrel which is not made larger even when a battery is incorporated therein. CONSTITUTION:A battery case 18 constituting a battery housing chamber is arranged near the trailing edge of the lens barrel (front of a backmost lens and ahead of a mount 2), and the axial line of the battery 19 is made parallel with one side of the aperture of a camera main body, etc., in the battery housing chamber. By such constitution, the battey case 18 is made as close as possible to the optical axis of a lens, so that the diameter of the lens barrel is prevented from becoming larger. Then, a large space for a lens mechanism is secured in front of the battery case 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens barrel that can be attached to and detached from a video camera or a still camera, and more particularly to a lens barrel with a built-in battery.

[0002]

2. Description of the Related Art As a lens barrel that can be attached to and detached from a camera body, a battery-built-in lens barrel in which a battery is built in has been proposed.

[0003]

In the above-mentioned lens barrel of the prior art, if the battery is arranged with its longitudinal direction in the same direction as the optical axis, a large space is required in the optical axis direction, and the vicinity of the battery is in the optical axis direction. It is not possible to arrange a moving lens barrel with a large amount of movement or an external operation ring that rotates around the optical axis,
There is a drawback that the lens barrel becomes large due to the protruding battery portion and the large outer diameter.

Further, when the battery is arranged so that its longitudinal direction is at right angles to the optical axis, a large space can be taken in the optical axis direction, so that the battery can be rotated around the member moving in the optical axis direction or the optical axis. Both members can be arranged at more appropriate positions in terms of performance and operability. However, in order to cover the battery in which the longitudinal direction is arranged in the direction perpendicular to the optical axis, it is necessary to increase the outer diameter, and there is a drawback that the lens barrel is large and has a large open aperture value.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to provide an improved lens barrel, and in particular, a built-in battery which is smaller and lighter than the lens barrel of the prior art. It is to provide a lens barrel.

[0006]

[Means for Solving the Problems]
In order to solve the above problem (to realize a lens barrel with a built-in battery that is smaller and lighter than the lens barrel of the prior art), in the lens barrel according to the present invention, the battery storage location is near the rear end of the lens barrel. The rod-shaped battery is arranged such that its longitudinal axis is perpendicular to the optical axis of the lens barrel and in a plane orthogonal to the optical axis of the lens barrel, and is attached to the lens barrel. The battery is arranged such that at least one side of the aperture of the camera body is aligned or parallel to the longitudinal direction of the rod-shaped battery.

[0007]

According to the lens barrel of the present invention having the above-described structure, the space in the optical axis direction can be increased in the lens barrel, so that the lens frame that can move a large amount without increasing the total length of the lens barrel. Can be arranged, when a rotating member such as an operating ring is arranged, the rotation angle of the rotating member can be increased, and the lens barrel can be downsized because the battery can be arranged near the optical axis. The large free space allows the lens barrel with excellent operability and design to be realized.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show a first embodiment of the present invention, FIG. 1 is a longitudinal sectional view of an interchangeable lens barrel for a single lens reflex camera to which the present invention is applied, and FIG. 2 is a lens barrel of FIG. FIG. 6 is a horizontal cross-sectional view of the main part showing the vicinity of the battery storage chamber of FIG.

In FIG. 1, reference numeral 1 denotes a fixed barrel, and a mount 2 for mounting on a camera body (not shown) is fixed by screws. 3 is a guide cylinder, which is a fixed cylinder 1 and a screw 3a.
It is fixed by. 4, 5 and 6 are the first group lens barrels,
The second group lens barrel and the third group lens barrel are shown, and the optical lenses L1, L2, and
Each holds L3. Further, the first group lens barrel 4 is screwed and fixed to the guide tube 3, and the third group lens barrel 6 is also fixed to the guide tube 3 with screws 6a. The second group lens-barrel 5 has rollers 5a in three equal parts, and the rollers 5a are engaged with the rectilinear grooves 3b provided in the guide tube 3. Reference numeral 7 denotes a cam barrel, which is rotatably held by the guide barrel 3. The cam barrel 7 is provided with cam grooves 7a at three equal portions, and each engages with a roller 5a provided on the second lens barrel 5. That is, by rotating the cam barrel 7, the second group lens barrel 5 is moved in the optical axis direction by a known cam mechanism, and focus adjustment is performed.

Reference numeral 8 denotes a focus adjusting motor, which is a screw 9a.
It is fixed to the gear base plate 9 fixed to the guide tube 3 by means of screws. Reference numeral 10 denotes a gear train for transmitting the rotation torque of the motor 8 to the cam barrel 7, and the final stage gear 10a is
It meshes with a gear portion 7b provided on the cam barrel 7.

Reference numeral 11 denotes a known electromagnetic diaphragm unit, which is sandwiched and fixed by the diaphragm holding ring 12 and the guide tube 3. Reference numeral 13 denotes a mounting board for driving and controlling the focus adjusting motor 8 and the electromagnetic diaphragm unit 11 according to communication information from the camera body, and a contact 14 for communicating with the motor 8, the electromagnetic diaphragm unit 11 and the camera body, and an electric board. Wiring is done.

Reference numeral 15 denotes a switch for switching between automatic focus adjustment by the motor 8 and manual focus adjustment, which is held so as to be movable in the optical axis direction with respect to the fixed barrel 1. Reference numeral 16 denotes a clutch plate, the end of which is fixed to the switch 15 with screws 16a. The other end has a circumferential groove 10b provided on the gear 10a.
Is engaged with. Reference numeral 17 denotes an operation ring for manually adjusting the focus, which is rotatably held. And
A gear portion 17a is arranged around the rear portion of the operation ring 17. That is, by moving the switch 15, it is possible to switch the engagement between the gear 10 that transmits the torque of the motor and the gear 17a of the operation ring 17 while moving the gear 10a in the optical axis direction while keeping the gear 10a rotatable.

Reference numeral 18 denotes a battery case (that is, the main body of the battery storage chamber), and in the battery storage chamber inside the battery case 18, a cylindrical battery 1 serving as a power source for the control circuit of the mounting board 13 is provided.
9 is stored. In this embodiment, the battery case 18 is fixed to the guide tube 3 with screws 18a.

As shown in FIG. 2, the two batteries 19 are housed in the battery case 18 so as to be parallel to the plane orthogonal to the optical axis in the battery storage chamber, and the two batteries 19 are connected to the camera. The battery is stored so that the longitudinal direction of the battery is substantially parallel to the long side and the short side of the aperture in the main body.

The battery storage chamber, that is, the battery case 18 is installed near the mount 2 and behind the lens L3, which is the closest to the mount. The last lens L3
On the further rear side, when the light rays incident on the aperture shape of the camera are seen as a cross section parallel to the aperture, the shape approaches from the circular shape to the aperture shape as it approaches the aperture from the rearmost lens. The 35 mm still camera has a rectangular shape with rounded corners and a rectangular shape at the aperture position.

That is, in the lens barrel of the present embodiment, the battery 19 is arranged at a position very close to the optical axis by aligning the battery 19 with the long side and the short side of the rectangular aperture shape. Therefore, the outer diameter of the lens barrel can be reduced. In this embodiment, the back cover 20 for blocking the light and preventing the components from being seen is fixed to the mount 2 by the elastic force of the claw portion 20a.
In b, a cross section parallel to the aperture is formed into a substantially rectangular shape so as not to prevent a light ray incident on the aperture from being harmed, and a light shielding line is provided on the inner periphery. Then, the battery case 18 is attached to the back cover 20.
Notch 3 in the small diameter part of the guide tube so that it can be placed just outside
c is provided.

Reference numeral 21 denotes a battery lid for preventing the battery 19 from escaping from the battery storage chamber, and two claws 22 for holding the battery lid 21 in the lens barrel can be moved in the optical axis direction. Hold on. Further, the claws 22 are urged by springs 23 in directions away from each other.

Reference numeral 24 denotes a piece rotatably held in the battery lid 21, and a groove 24a for rotating a coin or the like is provided from the outside.

A disk-shaped plate cam 25 is screwed to the piece 24.
It is fixed by a, and the piece 24 is rotatably held in the battery lid 21. The plate cam 25 is provided with two end surface cams 25b, and the projections 22a provided on the two claws 22 are provided.
Are engaged.

The battery lid 21 has an opening 1 provided in the fixed cylinder 1.
When it is inserted into b, the inclined surface 22b of the claw 22 contacts the wall surface of the opening 1b, and the claw 22 is pulled into the battery lid 21 against the biasing force of the spring 23. When the battery lid 21 is further pushed in, the claw 22 is inserted into the hole 18b provided in the battery case 18 by the spring 23, and the battery lid 21 is held in the lens barrel.

During this time, the protrusion 22 of the claw 22 is provided inside the end surface cam 25b so that the claw 22 can be retracted and the battery lid 21 can be mounted at any position within the rotatable range of the piece 24.
A space is provided in which 2a does not interfere.

The battery 19 is mounted by moving it in the longitudinal direction of the battery, that is, in the direction A in FIG. When attaching and detaching the cylindrical battery, the battery outlet and the battery lid can be made smaller by moving the battery in its longitudinal direction. When there are a plurality of batteries, the batteries may be moved in the longitudinal direction, the batteries may be arranged so that the movement loci intersect, and the battery outlet and the battery lid may be arranged near the intersecting position. In this embodiment, 2
By inserting the two batteries 19 from the small opening 1b in directions different from each other at right angles to the optical axis, the opening 1b and the battery lid 21 can be made smaller, and the strength and operability are improved.

When the battery 19 is inserted into the battery case 18, the contact fittings 18c attached to the battery case 18 and the contact fittings 21a attached to the battery lid 21 urge the battery 19 in the opposite contact direction. Therefore, stable electrical connection can be made to the battery 19 and the battery lid 21 without rattling.

When removing the battery, the plate cam 25 is operated to rotate in the direction B in FIG. 3 so that the end cam 25b pulls the claw 22 inward and the battery lid is removed from the lens barrel. The battery 19 can be removed.

FIGS. 4 and 5 show the second and third embodiments of the interchangeable lens barrel according to the present invention. The main parts of the battery case portion disposed near the mount are shown in FIGS. Only the cross-section is shown. Further, those having the same functions as those in the first embodiment are indicated by the same numbers.

FIG. 4 is a cross-sectional view of the lens barrel of the second embodiment of the present invention, in which one cylindrical battery 19 is arranged below the camera when the lens barrel is mounted on the camera body. . In this embodiment as well, as in the first embodiment, the guide cylinder 3 is provided with the notch 3c so that the battery case 30 is arranged closer to the optical axis and the outer diameter of the lens barrel is kept small. .

The battery 19 can be attached and detached by moving it to the right in FIG. Reference numeral 31 denotes a battery lid, which is rotatably held around the fixed cylinder 1 and the pin 32. 33
Indicates a knob for opening and closing the battery lid 31, and the claw 34 is fixed with a screw. The claw 34 is held integrally with the knob 33 so as to be movable in the circumferential direction about the optical axis, and a spring 35 urges the tip of the claw 34 so as to project to the outside of the battery lid.

That is, the claw 34 falls into the hole 30a provided in the battery case 30, and the battery lid 31 is housed and held in the lens barrel. When the battery 19 is attached or detached, the knob 33 is operated to remove the claw 34 from the hole 30a of the battery case 30, so that the battery lid 31 is opened.

FIG. 5 shows a third embodiment of the present invention in which two cylindrical batteries 19 are arranged above and below the optical path. In this embodiment, as in the first and second embodiments, the battery 19
In order to arrange the light source closer to the optical axis, the light-shielding portion 20b of the back cover has a shape required for the light rays to reach the aperture shape of the camera, and the guide tube 3 is also provided with a notch 3c.

The two batteries 19 are moved to the right side in FIG. A battery lid 40 has a size that covers about one-third of the circumference of the fixed cylinder 1. Reference numeral 41 denotes a knob for opening and closing the battery lid 40, a groove that can be turned by a coin is provided in the operation portion, and a battery case 42 is provided inside.
The screw that engages with the threaded portion 42a is cut, and the E-ring 41a is fitted therein to prevent it from coming off. That is, the battery lid is opened and closed by removing the screw of the knob 41.

[0032]

As described above, according to the lens barrel of the present invention, the space in the optical axis direction can be increased in the lens barrel, so that the movement amount can be increased without increasing the total length of the lens barrel. A large lens frame can be arranged, when a rotating member such as an operation ring is arranged, the rotation angle of the rotating member can be increased, and the lens can be downsized because the battery can be arranged near the optical axis. Since the free space in the optical axis direction is large, it is possible to achieve a lens barrel with excellent operability and design.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a battery-equipped lens barrel according to a first embodiment of the present invention.

2 is a cross-sectional view of the lens barrel of FIG. 1 in the vicinity of a battery storage chamber.

FIG. 3 is a rear view of the battery cover of the lens barrel of FIG.

FIG. 4 is a transverse cross-sectional view of the lens barrel of the second embodiment of the present invention in the vicinity of the battery storage chamber.

FIG. 5 is a transverse cross-sectional view of a lens barrel of a third embodiment of the present invention in the vicinity of a battery storage chamber.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Fixed barrel 2 ... Mount 3 ... Guide barrel 4 ... 1st group lens barrel 5 ... 2nd group lens barrel 6 ... 3rd group lens barrel 7 ... Cam barrel 8 ... Motor 9 ... Gear base plate 10 ... Gear train 11 ... Aperture Unit 12 ... Aperture holding ring 13 ... Mounting board 14 ... Electrical contact 15 ... Switch 16 ... Clutch plate 17 ... Operation ring 18, 30, 42
... Battery case 19 ... Battery 20 ... Back lid 21,31,40 ... Battery lid 22,34 ... Claws 23,35 ... Springs 24,33,41
… Pick 25… Plate cam 32… Pin

Claims (3)

[Claims] 1. A lens barrel which is configured to be detachably mountable to an optical device body such as a camera body and which has a rod-shaped battery built-in, wherein the lens barrel has a battery housing near its rear end. A lens barrel having a chamber, and the battery storage chamber is configured to accommodate the battery such that a longitudinal direction of the battery is parallel to a contour line of an aperture of the optical device body. . 2. The battery storage chamber is configured to store two batteries, and at least one of the batteries has an axis parallel to a contour line of an aperture of the optical device body. The lens barrel according to claim 1, wherein a storage chamber is formed. 3. The battery storage chamber is configured to store two batteries in two storage spaces having different directions,
The lens barrel according to claim 1, wherein only one battery insertion / extraction port is provided in the battery storage chamber.