JPS5979807U

JPS5979807U - Photographic lens assembly

Info

Publication number: JPS5979807U
Application number: JP17618282U
Authority: JP
Inventors: 熱田　利一
Original assignee: 京セラ株式会社
Priority date: 1982-11-19
Filing date: 1982-11-19
Publication date: 1984-05-30

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は従来のダブルへリコイドを採用した望　・遠レ
ンズの断面図である。第２図は本考案による撮影レンズ
の組立体の第一の実施例を示す断面図である。第３図は
本考案による撮影レンズの組立体のレンズ繰り出し機構
のトルク特性を従来の望遠レンズの特性と比較したグラ
フである。第４図は本考案による撮影レンズの組立体の
第２の実施例を示す断面図であり、第５図は直進キーを
拡大して示した断面図である。１．１０１・・・マウント、２，１０２・・・絞り環、
３．１０３，２０３−・・固定筒、３ａ−ねじ部、３ｂ
・・・溝、４，１０４・・・固定外筒、５・・・ヘリコ
イ　□ド外筒、６・・・指標環、１０５・・・ＡＦカプ
ラ、１０６゛・・・主歯車、１０７・・・大歯車、１０
８・・・ヘリコイド外筒、９，１０９・・・距離環、１
１０・・・ボールベアリング、１２，１１２・・・手動
合焦環、１３・・・窓、１１４・・・ケース、１５，１
１５，２１５・・・雄へリコイド内筒、１５ａ、１１５
ａ、２１５ａ・・・キー溝、１１７，２１７・・・ロー
ラ、１１８゜２１８・・・軸、１　ｉ　９−・・フード
、１２０・・・ネーム環、２１．１２１・・・前玉レン
ズ群、２２，１２２・・・後玉レンズ群、２３・・・絞
り羽根機構。Figure 1 is a cross-sectional view of a conventional telephoto/distance lens that uses a double helicoid. FIG. 2 is a sectional view showing a first embodiment of the photographic lens assembly according to the present invention. FIG. 3 is a graph comparing the torque characteristics of the lens extension mechanism of the photographic lens assembly according to the present invention with the characteristics of a conventional telephoto lens. FIG. 4 is a sectional view showing a second embodiment of the photographic lens assembly according to the present invention, and FIG. 5 is an enlarged sectional view showing the straight key. 1.101...Mount, 2,102...Aperture ring,
3.103,203--Fixed tube, 3a-threaded part, 3b
... Groove, 4,104... Fixed outer cylinder, 5... Helicoid outer cylinder, 6... Index ring, 105... AF coupler, 106゛... Main gear, 107...・Large gear, 10
8... Helicoid outer cylinder, 9,109... Distance ring, 1
10...Ball bearing, 12,112...Manual focusing ring, 13...Window, 114...Case, 15,1
15,215...Male helicoid inner cylinder, 15a, 115
a, 215a...Keyway, 117,217...Roller, 118°218...Axis, 1 i 9-...Hood, 120...Name ring, 21.121...Front lens group , 22, 122... Rear lens group, 23... Aperture blade mechanism.

Claims

[Scope of utility model registration request]

(1) A fixed lens barrel, a rotating body that is rotatably supported by the fixed lens barrel and has a helicoid on its inner periphery, a helicoid that screws into the helicoid of the rotating body on its outer periphery, and a photographing lens on its inner periphery. In a photographing lens assembly comprising a lens mounting body attached thereto, a rotary roller is pivotally supported by a linear key fixed to the fixed lens barrel and engaged with a guide groove carved in the lens assembly; A photographic lens assembly characterized in that the rotation of the lens mount is converted into a linear motion by rotating a rotating body to move the lens mount forward and backward.

(2) The photographing lens assembly according to claim 1, wherein the rotating body is supported by the fixed lens barrel via a ball bearing.

(3) The rotating body is provided near the mount attachment part,
2. The photographing lens assembly according to claim 1, wherein the photographing lens assembly is connected to a connecting portion that receives a driving force from a camera body.

(4) The linear key extends from a mounting base provided on the fixed lens barrel near the mount mounting portion to the inside of the connecting portion, and the rotary roller is disposed at a tip end thereof. A photographing lens assembly according to claim 3 of the utility model registration claim.