Patent US5789485A successfully refreshed from Google Patents.
EP0453864A2
Expired / Lapsed
EP
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A photographic film cassette
Assignee: Fujifilm Holdings Corp
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Filing: 1991-04-09
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Granted: —
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Expires: 2011-04-09
Abstract
Abstract In a photographic film cassette (2), two light trapping fabrics (10,11) are provided each on two inside surfaces defining the film passageway. Inner recesses (17) retracted from the inside surfaces serve to attach inner edges of the light trapping fabrics thereto. The inner edges are attached to positions retracted from both inside surfaces. Adhesive agent (22) encloses the inner edges. In a preferred embodiment, tiny grooves (33) are formed in the recesses for enlarging an attaching force. The attachment can be kept intense. Further, two shell halves (13,14) include respective edges to be joined together to constitute the juncture. A projection is formed at a first edge. A contact projection of the second edge is to be fitted in an inside recess of the first edge. In preferred embodiment, a crooked portion is formed along the juncture. No light will come through the spacing beside the film. A film leader is advanced through the film passageway by rotating the spool to an outside of the film passage mouth. The film leader forced to advance will never peel off the light trapping fabrics, and reliably can be advanced without being stopped by the light trapping fabrics.
Inventors
- 👤 Kazunori Mizuno
- 👤 Masuhiko Hirose
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 16:34
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/28; G03B17/30; G03B2217/00; G03B2217/26; G03B2217/265
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
161 words
A photographic film cassette having a spool with photographic film wound thereon and a cassette shell for containing the film in a light-tight fashion and for supporting the spool rotatably, on which cassette shell a film passageway is formed for directing the film to a film passage mouth, said cassette comprising: two light trapping members provided each on upper and lower inside surfaces of said film passageway for trapping light; and at least one inner recess portion retracted from said upper and lower inside surfaces, or inclined on said upper and lower inside surfaces so as to increase a degree of retraction from said upper and lower inside surfaces in a direction toward an inside of said cassette shell, for attaching thereto at least one of inner edges of said respective light trapping members with respect to said cassette shell in order to attach at least one of said inner edges to positions retracted from said upper and lower inside surfaces.
Claim 2
Dependent Claim
36 words
A photographic film cassette as defined in claim 1, wherein said cassette shell includes first and second shell halves separated with respect to a juncture dividing said film passageway and an opening for supporting said spool.
Claim 3
Dependent Claim
57 words
A photographic film cassette as defined in claim 2, further comprising two outer recess portions retracted from said upper and lower inside surfaces for attaching thereto outer edges of said respective light trapping members with respect to said cassette shell in order to attach said outer edges to positions retracted from said upper and lower inside surfaces.
Claim 4
Dependent Claim
28 words
A photographic film cassette as defined in claim 3, wherein surfaces to be attached to said light trapping members are inclined in said inner and outer recess portions.
Claim 5
Dependent Claim
16 words
A photographic film cassette as defined in claim 2, wherein said light trapping members are fabrics.
Claim 6
Dependent Claim
29 words
A photographic film cassette as defined in claim 5, further comprising means for enclosing said inner edges in order to attach said light trapping fabrics to said film passageway.
Claim 7
Dependent Claim
16 words
A photographic film cassette as defined in claim 6, wherein said enclosing means is adhesive agent.
Claim 8
Dependent Claim
43 words
A photographic film cassette as defined in claim 7, wherein at least one of said upper and lower inside surfaces is provided with adhesive agent in a dotted disposition between said inner and outer recess portions to attach said light trapping fabrics thereto.
Claim 9
Dependent Claim
23 words
A photographic film cassette as defined in claim 6, wherein said at least one inner recess portion also serves for said enclosing means.
Claim 10
Dependent Claim
34 words
A photographic film cassette as defined in claim 2, further comprising a rough portion formed in said respective recess portions for enlarging a force of attaching said light trapping members to said film passageway.
Claim 11
Dependent Claim
25 words
A photographic film cassette as defined in claim 10, wherein said rough portion includes a plurality of tiny grooves formed in parallel with said spool.
Claim 12
Dependent Claim
19 words
A photographic film cassette as defined in claim 10, wherein said rough portion includes a plurality of tiny recesses.
Claim 13
Dependent Claim
28 words
A photographic film cassette as defined in claim 2, further comprising light-shielding means formed in said juncture for shielding a lateral edge portion of said film from light.
Claim 14
Dependent Claim
83 words
A photographic film cassette as defined in claim 13, wherein: said first and second shell halves include respectively first and second edges formed thereon for being joined together to constitute said juncture; and said light-shielding means includes a first projection formed at said first edge, and an inside projection of said second edge formed inside said second shell half for being fitted in an inside recess of said first edge formed inside said first shell half at a bottom of said first projection.
Claim 15
Dependent Claim
21 words
A photographic film cassette as defined in claim 13, wherein said light-shielding means is a deformed portion formed along said juncture.
Claim 16
Dependent Claim
33 words
A photographic film cassette as defined in claim 15, wherein said deformed portion is formed in a position where said juncture is in contact with both lateral ends of said light trapping members.
Claim 17
Dependent Claim
20 words
A photographic film cassette as defined in claim 16, wherein said deformed portion is in a shape of a crank.
Claim 18
Dependent Claim
21 words
A photographic film cassette as defined in claim 16, wherein said deformed portion is in a shape of a letter V.
Claim 19
Dependent Claim
18 words
A photographic film cassette as defined in claim 16, wherein said deformed portion is in an arcuate shape.
Claim 20
Dependent Claim
31 words
A photographic film cassette as defined in claim 15, wherein said deformed portion is formed in a position where said juncture is arranged beside outside surfaces of flanges of said spool.
Claim 21
Dependent Claim
33 words
A photographic film cassette as defined in claim 15, wherein said juncture is bent toward said light trapping members at both lateral ends of said film passage mouth to form said deformed portion.
Claim 22
Dependent Claim
176 words
A photographic film cassette having a spool with photographic film wound thereon and a cassette shell for containing the film in a light-tight fashion and for supporting the spool rotatably, on which cassette shell a film passageway is formed for directing the film to a film passage mouth, said cassette comprising: two light trapping members provided each on upper and lower inside surfaces of said film passageway for trapping light; two inner recess portions retracted from said upper and lower inside surfaces, or inclined on said upper and lower inside surfaces so as to increase a degree of retraction from said upper and lower inside surfaces in a direction toward an inside of said cassette shell, for attaching thereto inner edges of said respective light trapping members with respect to said cassette shell in order to attach said inner edges to positions retracted from said upper and lower inside surfaces; and means for advancing a film leader of said film through said film passageway by rotating said spool to an outside of said film passage mouth.
Claim 23
Dependent Claim
54 words
A photographic film cassette as defined in claim 22, wherein said advancing means includes: a separation claw formed in said cassette shell for separating said film leader from said wound film; and an annular ridge formed on an inner surface of said cassette shell for contact with an outermost turn of said wound film.
Claim 24
Dependent Claim
93 words
A photographic film cassette as defined in claim 22, wherein said advancing means includes: a separation claw formed in said cassette shell for separating said film leader from said wound film; and a projection member, projecting from and edge of a flange of said spool in a direction toward a middle of said cassette shell, for contact with an outermost turn of said wound film to prevent said wound film from loosening, said outermost turn of said wound film being released from said projection member by said separation claw pressing said projection member.
Claim 25
Dependent Claim
89 words
A photographic film cassette for containing photographic film wound on a spool in a cassette shell in a light-tight fashion, in which the film is advanced through a film passage mouth, said cassette comprising: a film passageway formed on said cassette shell for directing said film to said film passage mouth; two light trapping members provided each on upper and lower inside surfaces of said film passageway for trapping light; and means for enclosing said inner edges in order to attach said light trapping members to said film passageway.
Claim 26
Dependent Claim
96 words
A photographic film cassette for containing photographic film wound on a spool in a cassette shell in a light-tight fashion, in which the film is advanced through a film passage mouth, said cassette comprising: a film passageway formed on said cassette shell for directing said film to said film passage mouth; two light trapping members provided each on upper and lower inside surfaces of said film passageway for trapping light; and a rough portion formed on said upper and lower inside surfaces for enlarging a force of attaching said light trapping members to said film passageway.
Claim 27
Dependent Claim
140 words
A photographic film cassette having a spool with photographic film wound thereon and a cassette shell for containing the film in a light-tight fashion and for supporting the spool rotatably, on which cassette shell a film passageway is formed for directing the film to a film passage mouth, said cassette comprising: first and second shell halves separated with respect to a juncture dividing said film passageway and an opening for supporting said spool; first and second edges formed respectively on said first and second shell halves for being joined together to constitute said juncture; a first projection formed at said first edge; and an inside projection of said second edge formed inside said second shell half for being fitted in an inside recess of said first edge formed inside said first shell half at a bottom of said first projection.
Claim 28
Dependent Claim
90 words
A photographic film cassette having a spool with photographic film wound thereon and a cassette shell for containing the film in a light-tight fashion and for supporting the spool rotatably, on which cassette shell a film passageway is formed for directing the film to a film passage mouth, said cassette comprising: two shell halves separated with respect to a juncture dividing said film passageway and an opening for supporting said spool; and a deformed portion formed in said juncture for shielding a lateral edge portion of said film from light.
References Cited (Backward Citations)
No citation records indexed.
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