JPH0361694U

JPH0361694U -

Info

Publication number: JPH0361694U
Application number: JP12035189U
Authority: JP
Priority date: 1989-10-12
Filing date: 1989-10-12
Publication date: 1991-06-17

Description

[Brief explanation of drawings]

第１図はこの考案の一実施例の平面図、第２図
は第１図−線矢視側面図、第３図はこの考案
の光源と受光素子の他の実施例を示す側面図、第
４図はこの考案の受光素子の他の実施例を示す斜
視図、第５図はこの考案の他の実施例の平面図、
第６図はこの考案のモード検出孔の他の実施例を
示す平面図、第７図は従来のモード検出装置を示
す平面図、第８図は第７図−線矢視側面図、
第９図および第１０図はこの従来例の動作を説明
するための裏面図である。２……カム溝、４ａ〜４ｄ，１８……モード検
出孔、５……ギヤ部、７ａ〜７ｄ……光源、８ａ
〜８ｄ……受光素子、９……リーフスイツチ、１
１……モータ、１２……システムコントロール部
、１３……係合ピン、１４……移動部材、１５…
…切欠部、２０……光検出部。なお、各図中、同
一符号は同一、または相当部分を示す。 FIG. 1 is a plan view of one embodiment of this invention, FIG. 2 is a side view taken along the line in FIG. 1, and FIG. 3 is a side view showing another embodiment of the light source and light receiving element of this invention. FIG. 4 is a perspective view showing another embodiment of the light-receiving element of this invention, and FIG. 5 is a plan view of another embodiment of this invention.
FIG. 6 is a plan view showing another embodiment of the mode detection hole of this invention, FIG. 7 is a plan view showing a conventional mode detection device, FIG. 8 is a side view taken from FIG.
FIGS. 9 and 10 are rear views for explaining the operation of this conventional example. 2...Cam groove, 4a to 4d, 18...Mode detection hole, 5...Gear part, 7a to 7d...Light source, 8a
~8d... Light receiving element, 9... Leaf switch, 1
DESCRIPTION OF SYMBOLS 1... Motor, 12... System control part, 13... Engagement pin, 14... Moving member, 15...
...notch portion, 20...photodetection section. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims

[Scope of utility model registration request]

A mode detection device for detecting an operating mode of a magnetic recording and reproducing device, comprising: a system control unit that controls switching of the operating mode; and a rotation drive unit controlled by the system control unit.
A cam that has a gear part that engages with the rotational drive part formed on its periphery and a cam groove that determines the operating mode, and a position that is determined for each rotational position when setting each operating mode of this cam. A light source and a light receiving element are arranged to detect light passing through the mode detection hole corresponding to the operation mode when each operation mode of the cam is set. a plurality of photodetecting units, and the mode detection is configured such that the system control unit discriminates which photodetecting unit the photodetection signal is from and identifies its operation mode. Device.