JPS63195613A - Lens incorporating electrical equipment - Google Patents

Abstract

PURPOSE:To incorporate electrical equipment without increasing the size of a lens barrel by arranging a sheet body for the electrical equipment in a gap part as a dead space on the side of the internal surface of a 1st fixed lens barrel part where no light beam passes, and then mounting electrical components. CONSTITUTION:The 1st fixed lens barrel part 1 has the gap part 14 nearby the inner peripheral surface, the sheet type body 16 for the electrical equipment is arranged at a specific position in the gap part 14, and a 2nd fixed lens barrel part 2 is joined with the 1st fixed lens barrel part 1 and has a means for holding the sheet body 16 for the electrical equipment at a specific position. Then when both lens barrel parts 1 and 2 of the 1st fixed lens barrel part 1 and the 2nd fixed lens barrel part 2 are joined, abutting surfaces 1a and 2b for positioning control their mutual relative positions. Consequently, electric components and electric circuits are mounted in the gap part 14 in the lens barrel with high density.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] 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 that allows electrical components to be mounted within the lens barrel.

[Prior Art] In recent years, electronic cameras, video cameras, etc., have been equipped with lenses for autofocus driving, zooming driving, aperture driving, shutter driving, etc. as they become more dynamic and electronic. actuators are increasingly being installed.

In this case, considering the miniaturization of the camera body, the simplification of the electrical connection between the body and lens, the total space efficiency of the body and lens, etc., the electric circuit such as ROM for driving the actuator and controlling the lens barrel is Therefore, it is necessary to create a space within the lens to mount the electrical components. However, in order to create space for mounting electrical components and circuits within the lens, it is naturally necessary to avoid the lens optical path, and due to the mounting space, lenses are usually cylindrical. It is also undesirable in terms of appearance and operability to have a portion of the lens barrel protrude outward.

In addition, as a conventional model of this kind, the Utility Model 61-2117
A circuit mounting structure for a 1R child camera disclosed in Publication U;3 has been proposed. However, this technical means has a lens with a small diameter such as a relay lens arranged inside, and a flexible electric circuit on the outer periphery of the lens fixing frame, which is attached to the camera body at the outer periphery. Although it uses the dead space inside the body by wrapping a circuit board around it, it does not place any electrical components or circuits inside the lens barrel.

[Interlayer point 3 to be solved by the invention. Therefore, if you try to find a space for mounting inside the lens barrel without increasing the outer diameter of the lens barrel, the inside of the cylindrical fixed barrel outside the lens must be It becomes a ring-shaped part that exists on the side.

Incidentally, the lens barrel of recent zoom lenses used in electronic cameras, video cameras, etc. is generally composed of a large-diameter tube section with a large diameter in the front half and a small-diameter tube section in the rear half. This is because in the case of a zoom, the lens optical system has a large-diameter lens called a power lens that narrows down the light beam with a strong refractive index lens in the front lens.
Behind this power lens, a variable power lens such as a variator or a compensator is placed, which has a diameter approximately half that of the above power lens, and behind this, a relay lens system with approximately the same diameter as the variable power lens is installed. This is based on the fact that the zoom ring is placed around the variable power lens to make it easier to hold the zoom ring when holding the lens. Due to the large diameter of the lens and the placement of the zoom ring, the diameter of the front half of the lens barrel is large, while the diameter of the rear half is small because it only houses the relay lens system. . Therefore, inside the zoom ring and around the outer periphery of the variable power lens, there is a considerable amount of void space through which light rays do not pass, resulting in an extravagant design.

An object of the present invention is to provide a lens with a built-in electrical component that focuses on such a cavity within the lens barrel and allows electrical components and circuits to be mounted in the cavity with high density.

c. Means and operation for solving the problem] In order to achieve the above object, the present invention includes: a first fixed lens barrel having a cavity near the inner circumferential surface; a second fixed lens barrel part joined to the first fixed lens barrel part and having means for holding the electrical equipment sheet member in the predetermined position; A built-in electrical component characterized in that the lens barrel portion and the second fixed lens barrel portion each have a positioning contact surface for regulating their relative positions when the two lens barrel portions are joined. lens.

[Example] The present invention will be described below with reference to an illustrated example. In this example, the present invention is applied to a linear zoom lens in which the front half of the lens barrel has a large diameter and the rear half has a small diameter. A lens barrel in which a gap exists between the outer periphery of the optical system, i.e.
It goes without saying that the present invention is similarly applicable to lens barrels having substantially the same diameter over the entire length and having a large diameter as a whole.

In FIG. 1, the zoom lens optical system includes a large diameter power lens group L1. A variable magnification lens group L consisting of a lens group having a lens diameter approximately half of this lens group, and a relay lens group L a , L 4 consisting of a lens group having a lens diameter approximately the same as the diameter of lens 2' of this variable magnification lens group L2. and are sequentially arranged within the lens barrel. Among these, the variable magnification lens 1'F for zooming
During zooming, L2 moves straight in the optical axis direction to perform a zooming operation.

The lens barrel has a first fixed lens barrel part 1 with a large diameter that constitutes a front half thereof, and a second fixed lens barrel part with a small diameter that is integrally joined to the first fixed lens barrel part 1 and constitutes a rear half part. 2, the power lens group L and the variable magnification lens group L2 are the first
In the fixed lens barrel section 1, there is also the relay lens group L3.1'. L4 is the second fixed lens barrel part 2
Each is placed within the

That is, on the inner circumferential surface of the front end of the first fixed lens barrel section 1,
A power lens group L1 is supported by a lens holding member 3, and a guide tube 4 for movably supporting a variable power lens group L2 is located behind the lens group L. A variable magnification lens group L2 is disposed within the guide cylinder 4 as an inner cylinder, and is movably disposed in the optical axis direction by a lens holding member 5. Further, the relay lens group L3 is arranged by a lens holding member 6 on the inner circumferential surface near the front end of the second fixed lens barrel section 2, and a lens holding member is disposed on the inner circumferential surface near the rear end. 7, the relay lens group L4 is arranged.

The second fixed lens barrel section 2 has a coupling flange 2a formed of an outward flange on its front end surface, and the outer circumferential surface of this flange 2a and the front surface near the outer circumference are connected to a positioning abutment surface 2b. It becomes. That is, this abutment surface 2b has a step-like shape in the thick part of the rear end of the first fixed lens barrel 1 when the first fixed lens barrel 1 and the second fixed lens barrel 2 are connected. By fixing the flange 2a to the first fixed lens barrel part 1 with the connecting screw 8, the relative relationship between the two lens barrel parts is fixed. The positions of the lens groups L1 to L2 held in the first fixed lens barrel section 1 and the lens groups L3, . This allows the front and back positioning of L4, center deviation adjustment, etc. to be performed all at once. Further, a mounting mount 2C is formed at the rear end of the second fixed lens barrel section 2 for detachably mounting the zoom lens barrel on a camera body (not shown).

On the other hand, as shown in FIG. 2, the guide tube 4 has an outward fixing flange 4a formed at its front end, and a guide groove 4b extending in the optical axis direction in the middle of the body. The holes are drilled at equally spaced positions (three locations in this embodiment).

These guide grooves 4b are for inserting zoom drive pins 9 (see FIG. 1), and the zoom drive pins 9 are arranged at equal intervals on the outer periphery of the lens holding member 5 that supports the variable magnification lens group L2. They are fixedly planted in the respective positions (three positions in this example) in the radial direction. The reason why a plurality of zoom drive pins 9 are provided at equal intervals in this way is to ensure smooth zoom drive. ) to move in the optical axis direction. And guide tube 4
Three protruding arms 4C extending in the radial direction are provided at equally spaced positions on the outer periphery of the rear end. Each of these protruding arms 4C
is for providing coaxiality of the guide tube 4 with respect to the lens optical axis. That is, since the guide tube 4 is supported in a cantilevered manner, there is a risk that the rear end portion may move unintentionally. Therefore, by providing the protruding arm 4C and bringing the distal end surface of the arm 4C into contact with the inner circumferential surface of the first fixed chain cylinder part 1, as shown in FIG. Consideration is given to keeping it coaxial on the optical axis. Guide cylinder 4 formed in this way
By overlapping the flange 4a with the partition wall 1b consisting of an inward flange formed near the front of the first fixed lens barrel part 1 and tightening this with the mounting screw 11, the guide barrel 4 is assembled.
is integrally fixed to the first fixed lens barrel section 1.

A zoom ring 10 is rotatably fitted on the outer circumferential surface of the first fixed lens barrel section 1 in correspondence with the guide tube 4, and is screwed onto the outer circumference of the front end of the #11'gJ section 1. The zoom ring retaining ring 12 prevents the zoom ring from coming off. This zoom ring 10 includes a variable magnification lens group L2 as shown in FIG.
A cam slot 10a for zoom driving is provided in the guide groove 4 of the guide cylinder 4.
The zoom drive pin 9 is inserted through a guide groove IC having the same shape and size as the guide groove 4b, which is bored in the optical axis direction in the first fixed lens barrel portion 1. The cam slot 10a is covered by the zoom ring 10, and is covered with a rubber ring 13 which is non-slip so that the zoom ring 10 can be easily rotated so as not to be exposed to the outside.

Returning to FIG. 1, the lens barrel configured in this way,
An electrical component sheet 1G having electrical components attached thereto is disposed within the gap 14 between the guide tube 4 and the first fixed lens barrel portion 1. This electrical equipment sheet-like body 16 is attached and disposed on the outer peripheral surface of the support ring 17. In this embodiment, the support ring 17 is formed of a relatively long cylindrical body in the optical axis direction as shown in FIG. (see FIG. 1), the support ring 17 is integrally fixed to the second fixed lens barrel part 2 by tightening it to the flange 2a of the second fixed lens barrel part 2, and the electrical component sheet-like body 16 is attached to the guide barrel 4. arranged around. In addition, this support ring 17
Also the above guide? A cut groove 17b is provided in the portion facing R4b and 1c from the front end in the optical axis direction, so as not to interfere with the movement of the zoom drive pin 9. An electrical component sheet 16 such as a flexible printed circuit board having an electrical circuit connected to electrical components such as capacitors, resistors, and ICs is wound around the outer peripheral surface of the support ring 17. When the body 16 is wrapped around the support ring 17, it has a shape that does not hinder the movement of the zoom drive pin 9.

According to the lens with a built-in electrical component of this embodiment configured as described above, it is possible to skillfully fill the void, which is a dead space through which light rays do not pass, on the inner surface of the first fixed lens barrel 81 formed to have a large diameter. Since the electronic components are mounted by disposing an electrical component sheet attached by a support ring in this cavity, it is possible to increase the size of the lens barrel without changing the external shape. Electrical components can be built-in without the need for electrical components.

Furthermore, if the support ring 17 is made into a regular polygon instead of a cylinder, for example a hexagonal support ring 19 as shown in FIG. 5, the mounting surface of the electrical equipment sheet 16 will be a flat surface instead of a curved surface. This makes it convenient for installing electrical parts. That is, the flexible printed circuit board, which is a sheet-like body for electrical equipment wrapped around a support ring, is originally a flat sheet, and a capacitor is connected to the electric circuit formed on it.

Chip components such as resistors and ICs are connected by soldering, and as is well known, IC chips and the like are soldered from an element 20 with a thickness of 2 to 3 mm and about 1 square inch, as shown in FIG. A large number of connecting pins 20a extend horizontally toward the front, and these pins 20g are connected to the electric circuit of a sheet-like flexible substrate 21 by soldering, and this is wrapped around a support ring. Therefore, in this case, if the sheet-like body mounting surface of the support ring is a curved surface, the IC chip will be arranged horizontally, which causes the problem that the soldered part will easily come off. If the surface is flat as shown in the figure, this problem will be solved.・In addition, even in the support ring 19 formed in this polygonal shape, the mounting flange 19a
Needless to say, a cut groove 19b is also provided.

Furthermore, as shown in FIG. 6, the support rings 17 and 19 are formed entirely of a cylindrical support ring 22, and
A part of the circumference of the body is cut, this cut is formed on a flat surface 22c, and a flexible substrate 16a on which electrical components such as IC chips, which are preferably arranged horizontally, are arranged is fixed to this flat surface 22c with screws. However, the other electrical equipment sheet-like body 16 may be wrapped around the cylindrical support ring 22. Also in this case, the mounting flange 22a
Of course, a cut groove 22b is also provided.

On the other hand, in order to wrap and fix the flexible substrate as the electrical component sheet 16 on the outer circumferential surface of the support ring 17, 19, 22, screw fastening means was used in the above embodiment. Since the board has stiffness and elasticity, as shown in FIG. The mounting hole 16d formed in a certain flexible board may be fitted into the mounting hole 16d to be wound and fixed.

In addition to the illustrated support rings 17, 19, and 22, the holding means for the sheet-like body 16 for electrical equipment has appropriate rigidity corresponding to the sheet-like body 16, and holds the sheet-like body at its ends and/or Alternatively, it may be formed by, for example, a frame or the like that is held in the vicinity thereof.

[Effects of the Invention] As described above, according to the present invention, the positioning of the sheet-like body for electrical equipment is completely independent of the mutual alignment of each component within the first fixed lens barrel, so that the electrical equipment Not only is the entire built-in lens easy to assemble, but since the lens barrel is divided into two, installation of the support ring and electrical sheet, adjustment of the movement of the zoom ring, and maintenance are also much easier. A remarkable effect can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the upper half of a lens with a built-in electrical component showing an embodiment of the present invention, Fig. 2 is a perspective view of a guide tube, and Fig. 3 is a zoom drive provided in a zoom ring. FIG. 4 is a perspective view of the support ring. FIGS. 5 and 6 are perspective views showing other examples of the support ring. FIG. 7 is a perspective view showing an example of the IC chip. , Figure 8 is
FIG. 2 is a sectional view of a main part showing an example of a manner in which a sheet-like body for electrical equipment is attached.

Claims (1)

[Claims] a first fixed lens barrel having a gap near the inner circumferential surface; a sheet-shaped body for electrical equipment disposed at a predetermined position within the gap; and a sheet-like body for electrical equipment joined to the first fixed lens-barrel. a second fixed lens barrel section having means for holding the body in the predetermined position; A lens with a built-in electrical component, each having a positioning contact surface for regulating the relative position of the lens.