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US 7,626,764 B2Granted
Projecting lens system
AssigneeHon Hai Precision Industry Co., Ltd.
InventorsChun-Ling Lin, Chun-Hsiang Huang
Life of this patent
Estimating the term…
Abstract
A projecting lens system includes a first lens positive in power, a second lens negative in power, a third lens positive in power, and a fourth lens positive in power. The projecting lens system meets a criteria of 1.4<TT/f<1.7; where TT denotes a total length of the projecting lens system and f denotes an effective focal length of the projecting lens system.
Claims3
A projecting lens system comprising, in this order from the screen-side thereof:
- a first lens positive in power,
- a second lens negative in power,
- a third lens positive in power, and
- a fourth lens positive in power;
- the projecting lens system meeting a criteria of 1.4<TT/f<1.7;
- where TT denotes a total length of the projecting lens system and f denotes an effective focal length of the projecting lens system,
- wherein the specifications of the projecting lens are listed in the following table:
- Radius of
- Protecting lens
- curvature
- Thickness
- Reflective
- Abbe
- system100
- (mm)
- (mm)
- index
- number
- Screen-side
- 28.05737
- 12
- 1.696797
- 55.5322
- surface of
- the first lens 10
- SLM-side
- 35.18796
- 22.53765
- —
- —
- surface of
- the first lens 10
- Aperture
- ∞
- 7.933927
- —
- —
- stop 60
- Screen-side
- −14.61593
- 9.688149
- 1.84666
- 23.7779
- surface of the
- second lens 20
- SLM-side
- −22.67261
- 1
- —
- —
- surface of the
- second lens 20
- Screen-side
- ∞
- 12
- 1.696797
- 55.5322
- surface of
- the third lens 30
- SLM-side
- −47.49873
- 53.24028
- —
- —
- surface of
- the third lens 30
- Screen-side
- 67.60116
- 12
- 1.5168
- 64.1673
- surface of
- the fourth lens 40
- SLM-side
- ∞
- 3
- —
- —
- surface of
- the fourth lens 40
- wherein TT=135 mm, f=82.91 mm, BFL3=66.83 mm, f4=124.74 mm, AVE (Vb1-3)=55.5322, FNo=3.41, and 2ω=33.72°, where TT denotes a total length of the projecting lens system, f represents a focal length of the projecting lens system, BFL3 denotes a back focal length of the projecting lens system, AVE (Vb1-3) denotes an average value of Abbe numbers of the first lens and the third lens, FNo represents the aperture F-number, and 2ω represents a field angle of the projecting lens system.
78 more elements
A projecting lens system comprising, in this order from the screen-side thereof:
- a first lens positive in power,
- a second lens negative in power,
- a third lens positive in power, and
- a fourth lens positive in power;
- the projecting lens system meeting a criteria of 1.4<TT/f<1.7;
- where TT denotes a total length of the projecting lens system and f denotes an effective focal length of the projecting lens system,
- wherein the specifications of the projecting lens are listed in the following table:
- Radius of
- Reflective
- Abbe
- Projecting lens system 100
- curvature(mm)
- Thickness(mm)
- index
- number
- Screen-side surface of the first lens 10
- 25.25499
- 12.5
- 1.62041
- 60.3236
- SLM-side surface of the first lens 10
- 32.98193
- 71.5604
- —
- —
- Aperture stop 60
- ∞
- 8.639082
- —
- —
- Screen-side surface of the second lens 20
- −13.55623
- 8.940455
- 1.755201
- 27.5795
- SLM-side surface of the second lens 20
- −20.87062
- 1
- —
- —
- Screen-side surface of the third lens 30
- ∞
- 12.5
- 1.62041
- 60.3236
- SLM-side surface of the third lens 30
- −43.81359
- 51.76006
- —
- —
- Screen-side surface of the fourth lens 40
- 93.72847
- 12.6
- 1.743972
- 44.8504
- SLM-side surface of the fourth lens 40
- ∞
- 3
- —
- —
- wherein TT=130 mm, f=82.52 mm, BFL3=66.86 mm, f4=125.98 mm, AVE (Vb1-3)=60.3236, FNo=3.41, and 2ω=34°, where TT denotes a total length of the projecting lens system, f represents a focal length of the projecting lens system, BFL3 denotes a back focal length of the projecting lens system, AVE (Vb1-3) denotes an average value of Abbe numbers of the first lens and the third lens, FNo represents the aperture F-number, and 2ω represents a field angle of the projecting lens system.
58 more elements
A projecting lens system comprising, in this order from the screen-side thereof:
- a first lens positive in power,
- a second lens negative in power,
- a third lens positive in power, and
- a fourth lens positive in power;
- the projecting lens system meeting a criteria of 1.4<TT/f<1.7;
- where TT denotes a total length of the projecting lens system and f denotes an effective focal length of the projecting lens system,
- wherein the specifications of the projecting lens are listed in the following table:
- TABLE 3
- Radius of
- Reflective
- Abbe
- Projecting lens system 100
- curvature(mm)
- Thickness(mm)
- index
- number
- Screen-side surface of the first lens 10
- 25.14608
- 12.8
- 1.651597
- 58.5507
- SLM-side surface of the first lens 10
- 34.77398
- 14.76302
- —
- —
- Aperture stop 60
- ∞
- 9.944934
- —
- —
- Screen-side surface of the second lens 20
- −13.71061
- 9.668122
- 1.784696
- 26.2912
- SLM-side surface of the second lens 20
- −22.50503
- 1.3
- —
- —
- Screen-side surface of the third lens 30
- ∞
- 9.698434
- 1.62041
- 60.3236
- SLM-side surface of the third lens 30
- −43.81694
- 49.42549
- —
- —
- Screen-side surface of the fourth lens 40
- 92.80003
- 12.8
- 1.743972
- 44.8504
- SLM-side surface of the fourth lens 40
- ∞
- 3
- —
- —
- wherein TT=125 mm f=84.53 mm, BFL3=69.84 mm, f4=130.81 mm, AVE (Vb1-3)=59.4372, FNo=3.44, and 2ω=33° where TT denotes a total length of the projecting lens system, f represents a focal length of the projecting lens system, BFL3 denotes a back focal length of the projecting lens system, AVE (Vb1-3) denotes an average value of Abbe numbers of the first lens and the third lens, FNo represents the aperture F-number, and 2ω represents a field angle of the projecting lens system.
59 more elements
Dependencies are inferred from the claim text.