US3848982A — Microfilm reader

Claim 1

Independent Claim 199 words

A microfilm reader for reading micro images recorded on a microfilm comprising a housing having an opening, a projection screen disposed in said housing, optical means for projecting images on said microfilm toward said screen; a first light source unit having a first base disposed thereon a main lamp, an optical system for directing the light from said main lamp to said microfilm and a plug connected to said main lamp; a second light source unit having a second base disposed thereon an auxiliary lamp connected to an auxiliary electric source, an optical system for directing the light from said auxiliary lamp to said microfilm and a plug not electrically connected to said auxiliary lamp; said first and second bases having said respective plugs at corresponding fixed positions and having the same configuration for permitting them to be selectively and exchangeably fitted into and detached from said opening of said housing in a drawerlike fashion; and a snap member fixedly provided in said housing for holding either of said bases by engaging either of said plugs when either of said light source units are inserted in said opening, said snap member being electrically connected to an AC electrical source.

Claim 2

Dependent Claim 199 words

A microfilm reader for reading micro images recorded on a microfilm comprising a housing having an opening, a projection screen disposed in said housing, optical means for projecting images on said microfilm toward said screen; a first light source unit having a first base disposed thereon a main lamp, an optical system for directing the light from said main lamp to said microfilm and a plug connected to said main lamp; a second light source unit having a second base disposed thereon an auxiliary lamp connected to an auxiliary electric source, an optical system for directing the light from said auxiliary lamp to said microfilm and a plug not electrically connected to said auxiliary lamp; said first and second bases having said respective plugs at corresponding fixed positions and having the same configuration for permitting them to be selectively and exchangeably fitted into and detached from said opening of said housing in a drawerlike fashion; and a snap member fixedly provided in said housing for holding either of said bases by engaging either of said plugs when either of said light source units are inserted in said opening, said snap member being electrically connected to an AC electrical source.

Claim 3

Dependent Claim 20 words

A microfilm reader according to claim 1, wherein said auxiliary power source connected to said auxiliary lamp comprises battery means.

Claim 4

Dependent Claim 68 words

A microfilm reader according to claim 2 wherein said case comprises a movable lid and two partitioned chambers in the shape of a rectangle, wherein a first partitioned chamber incorporates therein said battery means and a second partitioned chamber incorporates therein said second base disposed thereon said illuminating optical system and said auxiliary lamp, said second base being taken out of said case by moving said movable lid.

Claim 5

Dependent Claim 178 words

A microfilm reader for reading micro images recorded on a microfilm comprising a housing having an opening, a projection screen disposed in front face of said housing, optical means for projecting therethrough images on said screen, illuminating means for illuminating said microfilm and including a main unit having a main light source for connection with a main power source anD an auxiliary unit having a base, an illuminating optical system, an auxiliary light source for connection with an auxiliary power source and said base, said case comprising a movable lid and two partitioned chambers in the shape of a rectangle, wherein a first partitioned chamber incorporating therein said auxiliary power source and a second partitioned chamber incorporating therein said base disposed thereon said illuminating optical system and said auxiliary light source, said base being taken out of said case by moving said movable lid, and a film holder disposed between said optical means and said illuminating means for holding said microfilm, said units being selectively and movably mounted within said opening of said housing in a drawer-like fashion.

Claim 6

Dependent Claim 178 words

A microfilm reader for reading micro images recorded on a microfilm comprising a housing having an opening, a projection screen disposed in front face of said housing, optical means for projecting therethrough images on said screen, illuminating means for illuminating said microfilm and including a main unit having a main light source for connection with a main power source anD an auxiliary unit having a base, an illuminating optical system, an auxiliary light source for connection with an auxiliary power source and said base, said case comprising a movable lid and two partitioned chambers in the shape of a rectangle, wherein a first partitioned chamber incorporating therein said auxiliary power source and a second partitioned chamber incorporating therein said base disposed thereon said illuminating optical system and said auxiliary light source, said base being taken out of said case by moving said movable lid, and a film holder disposed between said optical means and said illuminating means for holding said microfilm, said units being selectively and movably mounted within said opening of said housing in a drawer-like fashion.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1977-11-18	1978-05-20	1978-11-19	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1981-11-18	1982-05-20	1982-11-19	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1985-11-18	1986-05-20	1986-11-19	$7700.00	Window Closed / Lapsed

Microfilm reader

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