JPH081688U - Lens barrel, projection lens device using the same, and projection television - Google Patents

Abstract

(57) [Summary] [Object] To obtain a lens barrel having a low cost and a high lens supporting precision, a projection lens device and a projection television using the same. In a lens barrel, each of the split semi-cylindrical members is provided with an engaging portion for contacting one surface of the lens and supporting the lens at a partial portion of the inner wall portion in the circumferential direction, and an elastic member. An elastic piece that contacts the other surface of the lens by a restoring force and presses the lens is provided. Further, a mating portion having two semi-cylindrical members, a plurality of coupling projections having hook-shaped ends, and a plurality of separate and independent projection insertion portions that engage with the coupling projections. And. [Effect] With a simple structure, the workability of manufacturing and assembling is improved, and the purpose can be easily achieved.

Description

[Detailed description of the device]       [0001]     [Industrial applications]   The present invention is a laser that forms part of an optical device such as a camera, a telescope, or a projection television. The assembly configuration of the lens.       [0002]     [Prior art]   As a conventional configuration example, there is a configuration described in JP-A-63-287807. , In this configuration, another member is required to integrally hold the divided lens barrel, In addition to being disadvantageous, it was not reliable enough.       [0003]     [Problems to be solved by the device]   The precision of the optical elements (lenses, prisms, mirrors) used in optical equipment is extremely high. It is well known that it is a bell, but similarly, a support system (such as a lens barrel) that supports it is also used. ) Is required to have a very high level of accuracy.       [0004]   For example, FIG. 1 is a perspective view showing a conventional lens assembly, in which the split lens barrels 1A and 1B are The lenses 2, 3 and 4 are divided by a plane parallel to the optical axis, and one of the split lens barrels 1A has a lens. After assembling the lenses 2, 3 and 4, the other split lens barrel 1B is combined and the ring 5 is attached to the lens barrel. It is fixed by fitting it in, or fixing with screws or the like. In the configuration, The surface that supports the lens in place supports the outer circumference of the lens over the entire surface, and the split type Since the lens barrel has a structure, when the lens barrel is molded with resin, the flatness of the entire circumference of the lens support surface Is difficult to obtain, and it is difficult to correct the flatness and the distance between lenses. For this reason, In the case of a lens, etc., the optical axis is tilted, the distance between lenses is poor, and the flatness is poor. This causes lens deformation, resulting in focus deterioration.       [0005]   In addition, another member is required to join and fix the split lens barrel to one tubular body, and Fees and assembly work costs also increased, and there was a problem in terms of cost reduction.       [0006]   The object of the present invention is to accurately support a lens in a two-part lens barrel. And to provide a configuration that can be assembled at low cost.       [0007]     [Means for Solving the Problems]   In order to achieve the above object, the present invention provides (A) In a lens barrel that holds a lens on a cylindrical inner wall,   Each half-cylindrical member divided into two along the surface along the optical axis of the lens (corresponding Example 6A). , 6B) comes into contact with one surface of the lens at a part of the inner wall portion in the circumferential direction, An engaging portion that supports the lens (corresponding to Embodiment 7) and elastic recovery at a position corresponding to the engaging portion. An elastic piece that contacts the other surface of the lens with the original force and presses the lens toward the engaging portion ( Corresponding embodiment 8).       [0008]   Also, (B) In a lens barrel that holds a lens (corresponding Example 9) on a cylindrical inner wall portion,   Two semi-cylindrical members divided by a surface along the optical axis direction of the lens (corresponding Example 6A, 6B) is coupled to one tubular body by a coupling means formed on the outer peripheral portion of the tubular portion. Have   The connecting means has hook-shaped portions at its ends and is separated from each other on both sides of the longitudinal midpoint of the cylindrical body. A plurality of coupling protrusions (corresponding to Example 10) having a configuration arranged at different positions, A portion of the mating projection to be engaged with the hook-shaped portion and a corresponding projection for each mating projection are provided. And a plurality of mating portions (corresponding Example 11) having a portion through which the projection is inserted and penetrated, , And are provided.       [0009]   further, (C) A lens is incorporated into the above (a) or (b) to form a projection lens device. A projection television is constructed by using (a) or (b).       [0010]   The engaging portion supports the lens at one position of the lens at a predetermined position. The elastic piece is The other surface of the lens is pressed by elastic restoring force, and the lens is sandwiched between the lens and the engaging part. It Multiple mating parts of independent construction are mated to the hooks of the corresponding mating projections. In this state, the two semi-cylindrical members of the lens barrel are combined to form a single cylinder.       [0011]     [Embodiment of device]   An embodiment of the present invention will be described below with reference to FIGS. Figure 2 shows the internal disconnection of the lens barrel A front view and FIG. 3 are external front views.       [0012]   The configuration of the lens and the split lens barrel of this embodiment is substantially the same as that shown in FIG. It That is, in addition to the lens 9, the split lens barrels 6A and 6B are also incorporated. As for the lens 9, an engagement for supporting one surface of the lens 9 at a predetermined position The part 7 and the elastic piece 8 that elastically supports the other surface of the lens are provided on the surface of the lens 9. It is provided to make point contact. In Fig. 3, the lens is held inside and As a means for combining the split lens barrel as one tubular body, the hook-shaped portions are provided in opposite directions. A split lens barrel (semi-cylindrical member) is provided with a coupling means including a coupling projection 10 and a mating portion 11. An example of the configuration provided is shown. In this configuration, the coupling projection 10 is formed in the longitudinal direction of the lens barrel. They are arranged at positions separated from each other on both sides of the midpoint of the direction, and the mating part 11 has the above-mentioned couplings. The structure has separate insertion parts independent of each other at positions corresponding to the projections 10 for use. There is. In this configuration, the mating portion is configured to have separate insertion portions independent of each other. Therefore, each coupling projection 10 and the mating portion are arranged at arbitrary positions in the longitudinal direction of the lens barrel. it can.       [0013]     [Effect of device]   According to the present invention, the following effects can be expected.       [0014] (1) No other member is required to connect the two split lens-barrels to one barrel, or Assembling the lens and lens barrel and aligning the optical axis of the lens can be done at the same time. It is also advantageous in terms of cost because it is possible to improve the efficiency, it is easy to ensure accuracy, and the cost is improved.       [0015] (2) After dividing the lens barrel again, it can be combined again, which is cost effective. It is profitable.       [0016] (3) Since the assembly work can be performed while grasping the side surface of the lens, clean the lens surface. It can be easily assembled in the assembled state and is easy to automate.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view illustrating a conventional structure. FIG. 2 is a sectional view showing a part of the structure of the embodiment of the present invention. FIG. 3 is an external plan view of the embodiment structure of the present invention. [Explanation of Codes] 6A ... Split barrel, 6B ... Split barrel, 7 ... Engaging portion, 8 ... Elastic piece, 9 ... Lens,
10 ... Protrusion for connection, 11 ... Mating part.

Claims (1)

[Scope of utility model registration request] 1. In a lens barrel for holding a lens (9) on a cylindrical inner wall portion, two respective semi-cylindrical members (6A, 6B) divided by a surface along the optical axis direction of the lens are An engaging portion (7) that contacts one surface of the lens and supports the lens at a partial position in the direction, and elastically restores by partially contacting the other surface of the lens at a position corresponding to the engaging portion. A lens barrel comprising: an elastic piece (8) for pressing the lens toward the engaging portion by a force; 2. In a lens barrel for holding a lens (9) on a cylindrical inner wall portion, two semi-cylindrical members (6A, 6B) divided by a surface along the optical axis direction of the lens are Has a structure to be coupled to one cylindrical body by means of a coupling means formed on the side wall, and the coupling means has a hook-shaped portion at an end thereof and is separated from each other on both sides of the longitudinal midpoint of the cylindrical body. A plurality of coupling protrusions (10) having a configuration arranged at a position, a portion of the coupling protrusion engaged with the hook-shaped portion, and the protrusions provided corresponding to each of the coupling protrusions and inserting the protrusions. A lens barrel, comprising: a plurality of mating portions (11) each having a penetrating portion. 3. A projection lens device in which a lens is incorporated into the lens barrel according to claim 1 of the utility model registration. 4. A projection lens device in which a lens is incorporated in the lens barrel according to claim 2 of the utility model registration. 5. A projection type television using the lens barrel according to claim 1 of the utility model registration. 6. A projection type television using the lens barrel according to claim 2 of the utility model registration claim.