FR345692A - Lenticular-parabolic-annular optical system - Google Patents

Lenticular-parabolic-annular optical system

Info

Publication number
FR345692A
FR345692A FR345692A FR345692DA FR345692A FR 345692 A FR345692 A FR 345692A FR 345692 A FR345692 A FR 345692A FR 345692D A FR345692D A FR 345692DA FR 345692 A FR345692 A FR 345692A
Authority
FR
France
Prior art keywords
lenticular
parabolic
optical system
annular optical
annular
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.)
Expired
Application number
FR345692A
Other languages
French (fr)
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.)
A BOAS RODRIGUES ET CIE Ste
Original Assignee
A BOAS RODRIGUES ET CIE Ste
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 A BOAS RODRIGUES ET CIE Ste filed Critical A BOAS RODRIGUES ET CIE Ste
Application granted granted Critical
Publication of FR345692A publication Critical patent/FR345692A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
FR345692A 1904-08-19 1904-08-19 Lenticular-parabolic-annular optical system Expired FR345692A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR345692T 1904-08-19

Publications (1)

Publication Number Publication Date
FR345692A true FR345692A (en) 1904-12-08

Family

ID=1394466

Family Applications (1)

Application Number Title Priority Date Filing Date
FR345692A Expired FR345692A (en) 1904-08-19 1904-08-19 Lenticular-parabolic-annular optical system

Country Status (1)

Country Link
FR (1) FR345692A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4905034A (en) * 1986-03-25 1990-02-27 Asahi Kogaku Kogyo Kabushiki Kaisha Automatic focusing projector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4905034A (en) * 1986-03-25 1990-02-27 Asahi Kogaku Kogyo Kabushiki Kaisha Automatic focusing projector
US4949115A (en) * 1986-03-25 1990-08-14 Asahi Kogaku Kogyo K.K. Automatic focusing projector

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