US5019852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Representation of depth of field in camera
Assignee: Pentax Corp
•
Filing: 1989-03-16
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Granted: 1991-05-28
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Expires: 2009-03-16
Abstract
Abstract In representing a depth of field in a camera, the depth of field is displayed on the basis of the magnitude of a field depth feeling Df, which corresponds to human feeling and sensitivity. The field depth feeling Df is obtained by processing at least one of a calculated depth of field, an object distance, a lens hyper-focal length, a diameter of a permissible circle of confusion, a lens aperture value and a lens focal length.
Inventors
- 👤 Masato Yamamoto
- 👤 Toshimasa Yamanaka
- 👤 Masahiro Nakajima
- 👤 Yutaka Ohsawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:36
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/18; G03B17/20
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
109 words
A device for representing a depth of field in a camera, which comprises: calculating means for calculating a field depth feeling Df, said field depth feeling Df being obtained by processing at least one of a calculated depth of field, an object distance, a lens hyper-focal length, a diameter of a permissible circle of confusion, a lens aperture value and a lens focal length; and display means for displaying the depth of field on the basis of the field depth feeling Df, wherein the field depth feeling Df is defined by the following equation: Df=l/D where, l is a calculated depth of field; and D is an object distance.
Claim 2
Independent Claim
109 words
A device for representing a depth of field in a camera, which comprises: calculating means for calculating a field depth feeling Df, said field depth feeling Df being obtained by processing at least one of a calculated depth of field, an object distance, a lens hyper-focal length, a diameter of a permissible circle of confusion, a lens aperture value and a lens focal length; and display means for displaying the depth of field on the basis of the field depth feeling Df, wherein the field depth feeling Df is defined by the following equation: Df=l/D where, l is a calculated depth of field; and D is an object distance.
Claim 3
Dependent Claim
46 words
The device according to claim 1, wherein said display means includes a single display segment displaying the field depth feeling df, and wherein two field depth states, respectively representative of deep and shallow depths of field, are displayed by turning the display segment on and off.
Claim 4
Dependent Claim
46 words
The device according to claim 1, wherein said display means includes two display segments displaying the field depth feeling df, and wherein two field depth states, respectively representative of deep and shallow depths of field, are displayed by turning-on a selected one of the display segments.
Claim 5
Dependent Claim
41 words
The device according to claim 1, wherein said display means includes at least three display segments displaying the field depth feeling df, and wherein these display segments are selectively turned on in accordance with values of the field depth feeling Df.
Claim 6
Dependent Claim
43 words
The device according to claim 4, wherein values of the field depth feeling Df, which are allotted respectively to the display segments, are set beforehand, and wherein the display segments are arranged in order from a small one of the allotted Df values.
Claim 7
Dependent Claim
83 words
The device according to claim 1, wherein said display means includes a plurality of display segments displaying the field depth feeling Df, wherein Dfs is defined as being equal to Df multiplied by N with respect to the field depth feeling Df, wherein the number of the display segments n is determined as follows: log.sub.a Dfs≦n≦log.sub.a Dfs+1 and wherein the display segments are arranged in order from a small one of their allotted Df values in accordance with the magnitude of the Dfs.
Claim 8
Dependent Claim
24 words
The device according to claim 6, wherein the base a is one of 2 and 3, and N is equal to 10 a .
Claim 9
Independent Claim
124 words
A device for representing a depth of field in a camera, which comprises: calculating means for calculating a field depth feeling Df, said field depth feeling Df being obtained by processing at least one of a calculated depth of field, an object distance, a lens hyper-focal length, a diameter of a permissible circle of confusion, a lens aperture value and a lens focal length; and display means for displaying the depth of field on the basis of the field depth feeling Df, wherein the field depth feeling Df is defined by the following equation: Df=(2·D·δ·F)/f.sup.2 where, D is an object distance; δ is a diameter of a permissible circle of confusion; F is a stop-down aperture value; and f is a lens focal length.
Claim 10
Independent Claim
124 words
A device for representing a depth of field in a camera, which comprises: calculating means for calculating a field depth feeling Df, said field depth feeling Df being obtained by processing at least one of a calculated depth of field, an object distance, a lens hyper-focal length, a diameter of a permissible circle of confusion, a lens aperture value and a lens focal length; and display means for displaying the depth of field on the basis of the field depth feeling Df, wherein the field depth feeling Df is defined by the following equation: Df=(2·D·δ·F)/f.sup.2 where, D is an object distance; δ is a diameter of a permissible circle of confusion; F is a stop-down aperture value; and f is a lens focal length.
Claim 11
Dependent Claim
46 words
The device according to claim 8, wherein said display means includes a single display segment displaying the field depth feeling Df, and wherein two field depth states, respectively representative of deep and shallow depths of field, are displayed by turning said display segment on and off.
Claim 12
Dependent Claim
47 words
The device according to claim 8, wherein said display means includes two display segments displaying the field depth feeling Df, and wherein two field depth states, respectively representative of deep and shallow depths of field, are displayed by turning on a selected one of said display segments.
Claim 13
Dependent Claim
41 words
The device according to claim 8, wherein said display means includes at least three display segments displaying the field depth feeling Df, and wherein said display segments are selectively turned on in accordance with values of the field depth feeling Df.
Claim 14
Dependent Claim
43 words
The device according to claim 11, wherein values of the field depth feeling Df, which are allotted respectively to said display segments, are set beforehand, and wherein said display segments are arranged in order from a small one of the allotted Df values.
Claim 15
Dependent Claim
82 words
The divice according to claim 8, wherein said display means includes a plurality of display segments displaying the field depth feeling Df wherein Dfs is defined as being equal to Df multiplied by N with respect to the field depth feeling Df, wherein the number of display segments n is determined as follows: Log.sub.a Dfs≦n≦Log.sub.a Dfs+1 and wherein said display segments are arranged in order from a small one of their allotted Df values in accordance with the magnitude of the Dfs.
Claim 16
Dependent Claim
24 words
The device according to claim 13, wherein the base a is one of 2 and 3 and N is equal to 10 a .
Claim 17
Independent Claim
123 words
A device for representing a depth of field in a camera, which comprises: calculating means for calculating a field depth feeling Df, said field depth feeling Df being obtained by processing at least one of a calculated depth of field, an object distance, a lens hyper-focal length, a diameter of a permissible circle of confusion, a lens aperture value and a lens focal length; and display means for displaying the depth of field on the basis of the field depth feeling Df, wherein the field depth feeling is defined by the following equation: Df=(D·δ·F)/f.sup.2 where, D is an object distance; δ is a diameter of a permissible circle of confusion; F is a stop-down aperture value; and f is a lens focal length.
Claim 18
Independent Claim
123 words
A device for representing a depth of field in a camera, which comprises: calculating means for calculating a field depth feeling Df, said field depth feeling Df being obtained by processing at least one of a calculated depth of field, an object distance, a lens hyper-focal length, a diameter of a permissible circle of confusion, a lens aperture value and a lens focal length; and display means for displaying the depth of field on the basis of the field depth feeling Df, wherein the field depth feeling is defined by the following equation: Df=(D·δ·F)/f.sup.2 where, D is an object distance; δ is a diameter of a permissible circle of confusion; F is a stop-down aperture value; and f is a lens focal length.
Claim 19
Dependent Claim
46 words
The device according to claim 15, wherein said display means includes a single display segment displaying the field depth feeling Df, and wherein two field depth states, respectively representative of deep and shallow depths of field, are displayed by turning said display segment on and off.
Claim 20
Dependent Claim
47 words
The device according to claim 15, wherein said display means includes two display segments displaying the field depth feeling Df, and wherein two field depth states, respectively representative of deep and shallow depths of field, are displayed by turning on a selected one of said display segments.
Claim 21
Dependent Claim
41 words
The device according to claim 15, wherein said display means includes at least three display segments displaying the field depth feeling Df, and wherein said display segments are selectively turned on in accordance with values of the field depth feeling Df.
Claim 22
Dependent Claim
43 words
The device according to claim 18, wherein values of the field depth feeling Df, which are allotted respectively to said display segments, are set beforehand, and wherein said display segments are arranged in order from a small one of the allotted Df values.
Claim 23
Dependent Claim
82 words
The device according to claim 15, wherein said display means includes a plurality of display segments displaying the field depth feeling Df wherein Dfs is defined as being equal to Df multiplied by N with respect to the field depth feeling Df, wherein the number of display segments n is determined as follows: Log.sub.a Dfs≦n≦Log.sub.a Dfs+1 and wherein said display segments are arranged in order from a small one of their allotted Df values in accordance with the magnitude of the Dfs.
Claim 24
Dependent Claim
24 words
The device according to claim 20, wherein the base a is one of 2 and 3 and N is equal to 10 a .
Claim 25
Independent Claim
119 words
A device for representing a depth of field in a camera, which comprises: calculating means for calculating a field depth feeling Df, said field depth feeling Df being obtained by processing at least one of a calculated depth of field, an object distance, a lens hyper-focal length, a diameter of a permissible circle of confusion, a lens aperture value and a lens focal length; and display means for displaying the depth of field on the basis of the field depth feeling Df, wherein the field depth feeling Df is defined by the following equation: Df=f/(δ·F) where, f is a lens focal length; δ is a diameter of a permissible circle of confusion; and F is a stop-down aperture value.
Claim 26
Independent Claim
119 words
A device for representing a depth of field in a camera, which comprises: calculating means for calculating a field depth feeling Df, said field depth feeling Df being obtained by processing at least one of a calculated depth of field, an object distance, a lens hyper-focal length, a diameter of a permissible circle of confusion, a lens aperture value and a lens focal length; and display means for displaying the depth of field on the basis of the field depth feeling Df, wherein the field depth feeling Df is defined by the following equation: Df=f/(δ·F) where, f is a lens focal length; δ is a diameter of a permissible circle of confusion; and F is a stop-down aperture value.
Claim 27
Dependent Claim
46 words
The device according to claim 22, wherein said display means includes a single display segment displaying the field depth feeling Df, and wherein two field depth states, respectively representative of deep and shallow depths of field, are displayed by turning said display segment on and off.
Claim 28
Dependent Claim
47 words
The device according to claim 22, wherein said display means includes two display segments displaying the field depth feeling Df, and wherein two field depth states, respectively representative of deep and shallow depths of field, are displayed by turning on a selected one of said display segments.
Claim 29
Dependent Claim
41 words
The device according to claim 22, wherein said display means includes at least three display segments displaying the field depth feeling Df, and wherein said display segments are selectively turned on in accordance with values of the field depth feeling Df.
Claim 30
Dependent Claim
43 words
The device according to claim 25, wherein values of the field depth feeling Df, which are allotted respectively to said display segments, are set beforehand, and wherein said display segments are arranged in order from a small one of the allotted Df values.
Claim 31
Dependent Claim
82 words
The device according to claim 22, wherein said display means includes a plurality of display segments displaying the field depth feeling Df wherein Dfs is defined as being equal to Df multiplied by N with respect to the field depth feeling Df, wherein the number of display segments n is determined as follows; Log.sub.a Dfs≦n≦Log.sub.a Dfs+1 and wherein said display segments are arranged in order from a small one of their allotted Df values in accordance with the magnitude of the Dfs.
Claim 32
Dependent Claim
24 words
The device according to claim 27, wherein the base a is one of 2 and 3 and N is equal to 10 a .
Claim 33
Independent Claim
108 words
A device for representing a depth of field in a camera, which comprises: calculating means for calculating a field depth feeling Df, said field depth feeling Df being obtained by processing at least one of a calculated depth of field, an object distance, a lens hyper-focal length, a diameter of a permissible circle of confusion, a lens aperture value and a lens focal length; and display means for displaying the depth of field on the basis of the field depth feeling Df, wherein the field depth feeling Df is defined by the following equation: Df=F/Fo where F is a stop-down aperture value; and Fo is an aperture value.
Claim 34
Independent Claim
108 words
A device for representing a depth of field in a camera, which comprises: calculating means for calculating a field depth feeling Df, said field depth feeling Df being obtained by processing at least one of a calculated depth of field, an object distance, a lens hyper-focal length, a diameter of a permissible circle of confusion, a lens aperture value and a lens focal length; and display means for displaying the depth of field on the basis of the field depth feeling Df, wherein the field depth feeling Df is defined by the following equation: Df=F/Fo where F is a stop-down aperture value; and Fo is an aperture value.
Claim 35
Dependent Claim
46 words
The device according to claim 29, wherein said display means includes a single display segment displaying the field depth feeling Df, and wherein two field depth states, respectively representative of deep and shallow depths of field, are displayed by turning said display segment on and off.
Claim 36
Dependent Claim
47 words
The device according to claim 29, wherein said display means includes two display segments displaying the field depth feeling Df, and wherein two field depth states, respectively representative of deep and shallow depths of field, are displayed by turning on a selected one of said display segments.
Claim 37
Dependent Claim
41 words
The device according to claim 29, wherein said display means includes at least three display segments displaying the field depth feeling Df, and wherein said display segments are selectively turned on in accordance with values of the field depth feeling Df.
Claim 38
Dependent Claim
43 words
The device according to claim 32, wherein values of the field depth feeling Df, which are allotted respectively to said display segments, are set beforehand, and wherein said display segments are arranged in order from a small one of the allotted Df values.
Claim 39
Dependent Claim
82 words
The device according to claim 29, wherein said display means includes a plurality of display segments displaying the field depth feeling Df wherein Dfs is defined as being equal to Df multiplied by N with respect to the field depth feeling Df, wherein the number of display segments n is determined as follows; Log.sub.a Dfs≦n≦Log.sub.a Dfs+1 and wherein said display segments are arranged in order from a small one of their allotted Df values in accordance with the magnitude of the Dfs.
Claim 40
Dependent Claim
24 words
The device according to claim 34, wherein the base A is one of 2 and 3 and N is equal to 10 a .
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-27 | 1994-11-26 | 1995-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-27 | 1998-11-26 | 1999-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-27 | 2002-11-26 | 2003-05-28 | $7700.00 | Window Closed / Lapsed |