JP2552278B2 - Lens with built-in electrical components - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens with a built-in electrical component, and more particularly, to a lens with a built-in electrical component in which an electrical component can be mounted in a lens barrel.

[Prior Art] In recent years, in electronic cameras, video cameras, etc., autofocus drive, zoom drive, aperture drive, shutter drive, etc. have been installed in the lens barrel due to automation and computerization. Actuators are being installed.

In this case, considering the miniaturization of the camera body, simplification of electrical connection between the body and the lens, total space efficiency of the body and the lens, etc., the electric circuits for driving and controlling the actuator are arranged in the lens barrel. Is most effective, and therefore, it is necessary to form a space for mounting electric components in the lens. However, a lens optical path must be avoided to form a space for mounting electric components and electric circuits in the lens, and a lens having a generally cylindrical shape due to a mounting space. Protruding a part of the lens barrel outward is also undesirable in terms of appearance and operability.

As a conventional type of this kind, a circuit mounting structure in an electronic camera disclosed in Japanese Utility Model Laid-Open No. 61-21176 has been proposed. However, in this technical means, a lens having a small lens diameter such as a relay lens is arranged inside, and a flexible electric circuit is provided in the outer peripheral portion located inside the camera body of the lens fixing frame whose outer peripheral portion is attached to the camera body. The circuit board is wound, and although the dead space in the body is used, no electrical component or electric circuit is arranged in the lens barrel.

[Problems to be Solved by the Invention] Therefore, if an attempt is made to find a mounting space in the lens barrel without increasing the outer diameter of the lens barrel, the inside of the cylindrical fixed barrel is located outside the lens. There is almost no space when the lens diameter is large, and in the case where the lens diameter is relatively small, the outer peripheral space is occupied by the lens holding member. Only a portion of the zoom lens having a small lens diameter, that is, a portion such as the outer peripheral portion of the relay lens group can be used as a mounting space, which is also difficult for high-density mounting.

However, in the case where the lens diameter is relatively small, it is possible to use the space in the radial direction corresponding to the distance between the lens groups. In this case, there is no problem if the lens is fixed, but if you have a movable lens such as a zoom lens, the variator lens for compensating and the compensator lens for Since it moves in the optical axis direction together with the lens holding frame, this space cannot be used and almost becomes a dead space.

However, in a normal zoom lens, the front lens for focusing has a large diameter, but the variator lens, compensator lens, relay lens, etc. for zooming arranged on the rear side have a small diameter. Since there is a considerable space between the fixed barrel and the holding frame of each of the above lenses only moves within this space,
Very wasteful.

Therefore, in the present invention, focusing on this point, not only the fixed lens and the movable lens, but also the space around the outer circumference of the lens having a relatively small diameter is skillfully used, and the space between the outer circumference and the fixed barrel is It is an object of the present invention to provide a lens with a built-in electrical component, which can be mounted with an electrical component.

[Means and Actions for Solving Problems] A lens with a built-in electrical component of the present invention includes a fixed barrel, a lens group in which the radial position of the lens itself is restricted to a predetermined position, and The component mounting space formed in the space between the inner peripheral surface of the fixed cylinder and the lens group outer periphery, and the lens group are supported so as to regulate the position, and correspond to the own component mounting space. And a positioning member having a void formed in the part.

[Examples] Hereinafter, the present invention will be described with reference to the illustrated examples.

It should be noted that the present embodiment describes a case where the present invention is applied to a zoom lens, but it goes without saying that the present invention is similarly applied to a fixed lens.

As shown in FIG. 1, the zoom lens system is, as is well known, a focus lens group L ₁ , a zoom variator lens group L ₂ , a zoom compensator lens group L ₃ , and a relay system lens groups L ₄ and L ₅ in this order from the front. It is arranged in the lens barrel. Among these, the zoom variator lens unit L ₂ and the compensator lens unit L ₃ are designed to move linearly in the optical axis direction during zooming to perform a zoom operation. Also, the variator lens group L ₂ , the compensator lens group L ₃ , the relay lens group
L ₄ and L ₅ have a small lens diameter and focus lens group L
The diameter of the lens is about half that of the _first lens.

The lens groups L _{2 to} L ₅ are respectively arranged in a fixed barrel 1 mounted on a camera body (not shown), and the focusing lens group L ₁ is fixed via a helicoid member 2 to the fixed barrel. It is arranged in the front part of 1. The helicoid member 2 has a helicoid female screw 2a engraved on the inner periphery of the rear portion thereof.
Is a helicoid male screw engraved on the outer periphery of the front part of the fixed cylinder 1.
A lens holding ring 3 that is attached to the fixed barrel 1 by being screwed into 1a and that supports the focusing lens unit L ₁ is screwed to the inner circumference of the front portion thereof. The helicoid member 2 is integrally attached with a screw 5 to a focus ring 4 fitted on the outer periphery thereof. Therefore, when the focus ring 4 is rotated, the helicoid member 2 integrated with the ring 4 is also fixed to the fixed barrel 1.
Then, the helicoid screws 2a, 1a move the focusing lens unit L ₁ forward and backward in the optical axis direction to perform the focusing operation.

On the other hand, the relay lens groups L ₄ and L ₅ are fixed near the rear end portion in the fixed barrel 1 by the lens holding members 6 and 7 which are positioning members so that their respective radial positions are restricted to predetermined positions. There is. The lens holding member 6,7
Is a donut plate-shaped disc, and the mounting screws 6a, 7a engraved on the outer peripheral surface thereof are screwed into the mounting screws 1b, 1c formed on the inner peripheral surface of the fixed barrel 1. As a result, it is fixed in the fixed cylinder 1. A diaphragm case 8 is attached to the back surface of the lens holding member 6 between the lens holding members 6 and 7, and the diaphragm blade 8a in the case 8 is the front surface of the lens holding member 7 and the relay lens group L. _The diaphragm 9 is adapted to be operated by an actuator 9 arranged around ₅ .

The variator lens group L ₂ is arranged near the focusing lens group L ₁ , and the compensator lens group L ₃ is arranged near the relay lens group L ₄ . That is, the lens groups L ₂ and L ₂ supported by the lens holding rings 11 and 12, respectively.
The L ₃ is arranged in the fixed cylinder 1 with its radial position restricted to a predetermined position by the connecting rings 13 and 14 which are positioning members. Drive pins 15 and 16 are fixedly planted in the connecting rings 13 and 14, respectively, and the pins 15 and 16 are inserted through guide groove holes 1d and 1e formed in the fixed barrel 1 in the optical axis direction, respectively. The zoom cam barrel 17 is rotatably fitted to the outer periphery of the fixed barrel 1 and is fitted into the cam groove holes 17a and 17b of the zoom cam barrel 17, respectively. The cam mechanism composed of the drive pins 15 and 16 and the cam grooves 17a and 17b is well known, and is fitted to the outer periphery of the zoom cam barrel 17 and is integrally attached to the cam barrel 17 by fixing screws 18. When the zoom ring 19 is rotated, the cam groove holes 17a and 17b move in the circumferential direction and the drive pins 15 and 16 move straight in the optical axis direction, so that the variator lens group L ₂ and the compensator lens group L ₃ emit light. Zooming is performed by moving in the axial direction.

In this way the lens zoom lens attached of groups, and the front of the lens holding member 6, the rear surface of the inner wall 1 _f formed in the front side of the fixed barrel 1, a substrate fixing member 21a, 21b relative It is provided facing. An electric component mounting member 22 made of a board having electric components and an electric circuit for operating the actuator 9 is fixed to both the members 21a and 21b in parallel with the optical axis. That is, the connecting rings 13 and 14 are formed with cutout portions (cavities) 13a and 14a in which the mounting member 22 is located, and the mounting portions 22a and 14a are formed by penetrating the notch portions 13a and 14a. A member 22 is provided.

In other words, the linking ring that is the above-mentioned paging member
Reference numerals 13 and 14 denote electrical component mounting members arranged in a component mounting space 23 formed in a gap between the inner peripheral surface of the fixed barrel 1 and the outer periphery of the variator lens group L ₂ and the compensator lens group L _3. It is formed so as to support the lens groups L ₂ and L ₃ while avoiding 22.

In this embodiment having such a configuration, the zoom ring is
19 is rotated to perform the zoom operation, and the variator lens unit L ₂ and the compensator lens unit L ₃ are displaced from the tele (telephoto) position shown in FIG. 1 to the wide (wide angle) position shown in FIG. Also, since the notches 13a and 14a are formed by thinning the connecting rings 13 and 14 that move straight ahead in the circumferential direction, there is no hindrance to the movement of the connecting rings 13 and 14.

Further, in the above-described embodiment, the cutouts 13a and 14a for arranging the substrate are provided only in the movable connecting rings 13 and 14 by thinning, but this is also provided in the fixed lens holding member 6 in the circumferential direction. If the cutouts are formed by lightening the holes at the same angle, an electric component mounting member having a long length in the optical axis direction can also be arranged in the lens.

As described above, in this embodiment, the space around the outer periphery of the relay lens unit L ₅ disposed at the rear end of the fixed barrel 1 is used as the space for the actuator, and the zooming disposed in the fixed barrel 1 is used. Since the space between the outer periphery of the lens group and the inner peripheral surface of the fixed barrel 1 is used as a space for arranging the electrical component mounting member, the conventional lens barrel does not change its external shape and is made into a lens with a built-in electrical component. be able to.

3 and 4 show cutouts 13a, which are formed in the connecting rings 13 and 14 or the lens holding member 6 by lightening.
14a and the respective positions of the positioning members are illustrated.

The example shown in FIG. 3 shows a cutout 1 formed in the connecting rings 13 and 14.
3a and 14a are formed by a partially arcuate fan-shaped opening extending over approximately 180 ° and are symmetrically or vertically arranged with respect to the optical axis.
Also, the electric component mounting member 22 made of an electric circuit printed circuit board for driving an actuator having an electric circuit such as a resistor 27 and an electric circuit is arranged respectively.
The positioning member is formed so as to support the lens unit L ₂ (L ₃ ) while avoiding a component mounting space.

Further, in the example shown in FIG. 4, cutouts 13a and 14a formed in the connecting rings 13 and 14 by lightening are formed in fan-shaped openings of partial arc shape in three equal positions around the optical axis. is there.

Incidentally, these notches are not limited to those shown in FIGS. 3 and 4, and it is needless to say that the shape and the number thereof may be arbitrarily provided if necessary.

In addition, an actuator for diaphragm and //
Alternatively, an AF actuator may be provided, and it goes without saying that the technical means of the present invention is applied even when the lens is of the AF type and configured as described above.

EFFECTS OF THE INVENTION As described above, according to the present invention, the arrangement of mounting components such as electric circuit components and electric circuits is not limited by the positioning members that hold the lens group, so that the component mounting space is relatively small. Can be secured freely and fully.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of an upper half portion of a lens having a built-in electric component showing an embodiment of the present invention, and FIG. 2 is an electric component interior showing a state where a zoom lens in the lens shown in FIG. 1 is moved. FIG. 3 and FIG. 4 are enlarged cross-sectional views of the upper half of the lens, and FIGS. 1 …… Fixed cylinder 13,14 …… Coupling ring (Poisoning member) 22 …… Electrical component mounting member 23 …… Component mounting space L _{1 to} L ₅ …… Lens group

Claims (1)

(57) [Claims] 1. A fixed barrel, a group of lenses whose radial direction position is restricted to a predetermined position in the fixed barrel, and a gap between an inner peripheral surface of the fixed barrel and an outer circumference of the lens group. And a positioning member that supports the lens group so as to regulate the position and has a space formed in a portion corresponding to its own component mounting space. A lens with a built-in electrical component.