FR2288989A1 - Projector for slide transparencies - has light intensity control device and push button remote control unit - Google Patents

Projector for slide transparencies - has light intensity control device and push button remote control unit

Info

Publication number
FR2288989A1
FR2288989A1 FR7435406A FR7435406A FR2288989A1 FR 2288989 A1 FR2288989 A1 FR 2288989A1 FR 7435406 A FR7435406 A FR 7435406A FR 7435406 A FR7435406 A FR 7435406A FR 2288989 A1 FR2288989 A1 FR 2288989A1
Authority
FR
France
Prior art keywords
light intensity
projector
control device
control unit
push button
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
FR7435406A
Other languages
French (fr)
Other versions
FR2288989B1 (en
Inventor
Jacques Rafflin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SOFED
Original Assignee
SOFED
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SOFED filed Critical SOFED
Priority to FR7435406A priority Critical patent/FR2288989A1/en
Priority to DE19752533982 priority patent/DE2533982A1/en
Publication of FR2288989A1 publication Critical patent/FR2288989A1/en
Application granted granted Critical
Publication of FR2288989B1 publication Critical patent/FR2288989B1/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B23/00—Devices for changing pictures in viewing apparatus or projectors

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Projection Apparatus (AREA)

Abstract

The regulating unit has control elements for the focussing mechanism, for the transparency changing mechanism and for light intensity of the control. The latter control device has an electronic control circuit in the projector housing, electrically connected with a manually operated potentiometer in the remote control unit. The transparency change take place when the potentiometer is set to minimum light brightness. The circuit input is through a transformer (35) to a rectifier (34) connected to the cathode (C) of a thyristor (36) and through a resistor (37) to the grid (9) of the thyristor.
FR7435406A 1974-10-22 1974-10-22 Projector for slide transparencies - has light intensity control device and push button remote control unit Granted FR2288989A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR7435406A FR2288989A1 (en) 1974-10-22 1974-10-22 Projector for slide transparencies - has light intensity control device and push button remote control unit
DE19752533982 DE2533982A1 (en) 1974-10-22 1975-07-30 DIAPOSITIVE IMAGER WITH LIGHT LEVEL CONTROL

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7435406A FR2288989A1 (en) 1974-10-22 1974-10-22 Projector for slide transparencies - has light intensity control device and push button remote control unit

Publications (2)

Publication Number Publication Date
FR2288989A1 true FR2288989A1 (en) 1976-05-21
FR2288989B1 FR2288989B1 (en) 1978-06-16

Family

ID=9144347

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7435406A Granted FR2288989A1 (en) 1974-10-22 1974-10-22 Projector for slide transparencies - has light intensity control device and push button remote control unit

Country Status (2)

Country Link
DE (1) DE2533982A1 (en)
FR (1) FR2288989A1 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1321783A (en) * 1962-05-02 1963-03-22 Voigtlaender Ag Projection lantern whose operating phases are controlled by a remote switch box

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1321783A (en) * 1962-05-02 1963-03-22 Voigtlaender Ag Projection lantern whose operating phases are controlled by a remote switch box

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
L ARTICLE "CROSS-FADE YOUR SLIDES WITH THIS SIMPLE DISSOLVE CONTROL" PAR R. BURNS ET J. BLAIR PARU AUX PAGES 120 A 122 ET 182 DE LA PUBLICATION US: "POPULAR MECHANICS" VOLUME 141, NO. 3, MARS 1974 ) *

Also Published As

Publication number Publication date
DE2533982A1 (en) 1976-04-29
FR2288989B1 (en) 1978-06-16

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Legal Events

Date Code Title Description
ST Notification of lapse