1. A display device comprising:
a display panel having a first substrate and a second substrate, the second substrate having a conductive light shielding film formed in a grid pattern;
a pulse-voltage-for-position-detection generating circuit that inputs a pulse voltage for position detection; and
a coordinate position computing circuit that computes a touch position on the conductive light shielding film, wherein
the conductive light shielding film is used as a touch panel electrode of electrostatic capacitive coupling system,
the conductive light shielding film has a shape with four corners,
the pulse-voltage-for-position-detection generating circuit supplies the pulse voltage for position detection to each of the four corners of the conductive light shielding film at different timings, and
the coordinate position computing circuit computes a touch position on the conductive light shielding film based on a voltage output from, when the pulse voltage for position detection is supplied to one of the four corners of the conductive light shielding film, another corner on the same diagonal line as the corner to which the pulse voltage is supplied.
2. The display device according to claim 1, wherein
the pulse voltage for position detection includes a first pulse voltage changing from a first voltage level to a second voltage level and a second pulse voltage changing from the second voltage level to the first voltage level.
3. The display device according to claim 1, wherein
the coordinate position computing circuit has an integrator circuit, and
the integrator circuit integrates a current in a first period and discharges a current in a second period.
4. The display device according to claim 1, wherein
the coordinate position computing circuit has a first integrator circuit that integrates a current in a first period and discharges a current in a second period and a second integrator circuit that integrates a current in a third period and discharges a current in a fourth period.
5. The display device according to claim 1, wherein
the pulse-voltage-for-position-detection generating circuit supplies the pulse voltage for position detection more than once to each of the corners, and
the coordinate position computing circuit outputs a voltage that is obtained by adding voltages obtained by supplying the pulse voltage for position detection more than once.
6. The display device according to claim 1, wherein
the coordinate position computing circuit has an integrator circuit and an AD conversion circuit connected at the later stage of the integrator circuit.
7. A display device comprising:
a display panel having a first substrate and a second substrate, the second substrate having a conductive light shielding film formed in a grid pattern;
a pulse-voltage-for-position-detection generating circuit that inputs a pulse voltage for position detection; and
a coordinate position computing circuit that computes a touch position on the conductive light shielding film, wherein
the conductive light shielding film is used as a touch panel electrode of electrostatic capacitive coupling system,
the conductive light shielding film has a shape with four corners,
the pulse-voltage-for-position-detection generating circuit supplies the pulse voltage to the four corners of the conductive light shielding film, and
the coordinate position computing circuit computes a touch position on the conductive light shielding film based on a voltage output from, when the pulse voltage for position detection is supplied to a first corner of the conductive light shielding film, a second corner positioned on a diagonal line with respect to the first corner and on a voltage output from, when the pulse voltage for position detection is supplied to a third corner of the conductive light shielding film, a fourth corner positioned on a diagonal line with respect to the third corner.
8. The display device according to claim 7, wherein
the coordinate position computing circuit computes a touch position based on a first time difference between a first time in which the voltage output from the second corner when the pulse voltage for position detection is supplied to the first corner becomes a predetermined voltage and a second time in which the voltage output from the first corner when the pulse voltage for position detection is supplied to the second corner becomes a predetermined voltage and on a second time difference between a third time in which the voltage output from the fourth corner when the pulse voltage for position detection is supplied to the third corner of the conductive light shielding film becomes a predetermined voltage and a fourth time in which the voltage output from the third corner when the pulse voltage for position detection is supplied to the fourth corner becomes a predetermined voltage.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An imaging lens system for imaging a subject image on an image sensing surface of an image sensing device, the imaging lens system comprising, from an object side:
an aperture stop;
a first lens element having a positive optical power and convex to the object side;
a second lens element having a negative optical power;
a third lens element having a positive optical power and convex to the object side;
a fourth lens element having a positive optical power and having a meniscus shape convex to the image side; and
a fifth lens element having a negative optical power and having a biconcave shape,
wherein
an image-side surface of the fifth lens element has, on a sectional plane including an optical axis, a point, other than an intersection with the optical axis, at which a tangent line is perpendicular to the optical axis,
conditional formulae (1) to (4) below are fulfilled:
0.8<ff1<1.30\u2003\u2003(1)
0.5<f4f1<0.90\u2003\u2003(2)
0.6<d4d3<2.0\u2003\u2003(3)
0.80<R3\u20141f<2.20\u2003\u2003(4)
where
f represents a focal length of the entire imaging lens system;
f1 represents a focal length of the first lens element;
f4 represents a focal length of the fourth lens element;
d3 represents an axial thickness of the second lens element;
d4 represents an axial aerial distance between the second and third lens elements; and
R3\u20141 represents a radius of curvature of the object-side surface of the third lens element on the optical axis; and
wherein an image-side surface of the third lens element has a negative optical power in a peripheral part.
2. The imaging lens system according to claim 1, wherein conditional formula (5) below is fulfilled:
0.73<f\u201412f3<1.50\u2003\u2003(5)
where
f\u201412 represents a composite focal length of the first and second lens elements; and
f3 represents a focal length of the third lens element.
3. The imaging lens system according to claim 2, wherein an image-side surface of the third lens element has a negative optical power in a peripheral part.
4. The imaging lens system according to claim 2, wherein conditional formula (6) below is fulfilled:
0.25<f4f3<0.8\u2003\u2003(6)
where
f3 represents the focal length of the third lens element; and
f4 represents the focal length of the fourth lens element.
5. The imaging lens system according to claim 2, wherein an object-side surface of the third lens element has a positive curvature that increases from an intersection with the optical axis to a peripheral part.
6. The imaging lens system according to claim 2, wherein conditional formula (7) below is fulfilled:
20<\u03bd1\u2212\u03bd2<70\u2003\u2003(7)
where
\u03bd1 represents an Abbe number of the first lens element; and
\u03bd2 represents an Abbe number of the second lens element.
7. The imaging lens system according to claim 2, wherein conditional formula (8) below is fulfilled:
1.60<n2<2.10\u2003\u2003(8)
where
n2 represents a refractive index for a d-line of the second lens element.
8. The imaging lens system according to claim 1, wherein conditional formula (6) below is fulfilled:
0.25<f4f3<0.8\u2003\u2003(6)
where
f3 represents a focal length of the third lens element; and
f4 represents the focal length of the fourth lens element.
9. The imaging lens system according to claim 8, wherein an object-side surface of the third lens element has a positive curvature that increases from an intersection with the optical axis to a peripheral part.
10. The imaging lens system according to claim 1, wherein conditional formula (7) below is fulfilled:
20<\u03bd1\u2212\u03bd2<70\u2003\u2003(7)
where
\u03bd1 represents an Abbe number of the first lens element; and
\u03bd2 represents an Abbe number of the second lens element.
11. The imaging lens system according to claim 1, wherein conditional formula (8) below is fulfilled:
1.60<n2<2.10\u2003\u2003(8)
where
n2 represents a refractive index for a d-line of the second lens element.
12. The imaging lens system according to claim 1, wherein conditional formula (6) below is fulfilled:
0.25<f4f3<0.8\u2003\u2003(6)
where
f3 represents the focal length of the third lens element; and
f4 represents the focal length of the fourth lens element.
13. The imaging lens system according to claim 1, wherein an object-side surface of the third lens element has a positive curvature that increases from an intersection with the optical axis to a peripheral part.
14. The imaging lens system according to claim 1, wherein conditional formula (7) below is fulfilled:
20<\u03bd1\u2212\u03bd2<70\u2003\u2003(7)
where
\u03bd1 represents an Abbe number of the first lens element; and
\u03bd2 represents an Abbe number of the second lens element.
15. The imaging lens system according to claim 1, wherein conditional formula (8) below is fulfilled:
1.60<n2<2.10\u2003\u2003(8)
where
n2 represents a refractive index for a d-line of the second lens element.
16. An imaging optical device comprising:
an imaging lens system for imaging a subject image on an image sensing surface of an image sensing device, the imaging lens system comprising, from an object side:
an aperture stop;
a first lens element having a positive optical power and convex to the object side;
a second lens element having a negative optical power;
a third lens element having a positive optical power and convex to the object side;
a fourth lens element having a positive optical power and having a meniscus shape convex to the image side; and
a fifth lens element having a negative optical power and having a biconcave shape,
wherein
an image-side surface of the fifth lens element has, on a sectional plane including an optical axis, a point, other than an intersection with the optical axis, at which a tangent line is perpendicular to the optical axis,
conditional formulae (1) to (4) below are fulfilled:
0.8<ff1<1.30\u2003\u2003(1)
0.5<f4f1<0.90\u2003\u2003(2)
0.6<d4d3<2.0\u2003\u2003(3)
0.80<R3\u20141f<2.20\u2003\u2003(4)
where
f represents a focal length of the entire imaging lens system;
f1 represents a focal length of the first lens element;
f4 represents a focal length of the fourth lens element;
d3 represents an axial thickness of the second lens element;
d4 represents an axial aerial distance between the second and third lens elements; and
R3\u20141 represents a radius of curvature of the object-side surface of the third lens element on the optical axis; and
wherein an image-side surface of the third lens element has a negative optical power in a peripheral part; and
an image sensing device for converting an optical image formed on an image sensing surface into an electrical signal,
wherein the imaging lens system is arranged such that an optical image of a subject is formed on the image sensing surface of the image sensing device.
17. An imaging optical device comprising:
an imaging lens system for imaging a subject image on an image sensing surface of an image sensing device, the imaging lens system comprising, from an object side:
an aperture stop;
a first lens element having a positive optical power and convex to the object side;
a second lens element having a negative optical power;
a third lens element having a positive optical power and convex to the object side;
a fourth lens element having a positive optical power and having a meniscus shape convex to the image side; and
a fifth lens element having a negative optical power and having a biconcave shape,
wherein
an image-side surface of the fifth lens element has, on a sectional plane including an optical axis, a point, other than an intersection with the optical axis, at which a tangent line is perpendicular to the optical axis,
conditional formulae (1) to (4) below are fulfilled:
0.8<ff1<1.30\u2003\u2003(1)
0.5<f4f1<0.90\u2003\u2003(2)
0.6<d4d3<2.0\u2003\u2003(3)
0.80<R3\u20141f<2.20\u2003\u2003(4)
where
f represents a focal length of the entire imaging lens system;
f1 represents a focal length of the first lens element;
f4 represents a focal length of the fourth lens element;
d3 represents an axial thickness of the second lens element;
d4 represents an axial aerial distance between the second and third lens elements; and
R3\u20141 represents a radius of curvature of the object-side surface of the third lens element on the optical axis; and
wherein an image-side surface of the third lens element has a negative optical power in a peripheral part; and
an image sensing device for converting an optical image formed on an image sensing surface into an electrical signal,
wherein the imaging lens system is arranged such that an optical image of a subject is formed on the image sensing surface of the image sensing device; so as to be additionally equipped with at least one of a function of taking a still picture of the subject or a function of taking a moving picture of the subject.
18. The digital device according to claim 17, wherein the digital device is a portable terminal.
19. An imaging lens system for imaging a subject image on an image sensing surface of an image sensing device, the imaging lens system comprising, from an object side:
an aperture stop;
a first lens element having a positive optical power and convex to the object side;
a second lens element having a negative optical power;
a third lens element having a positive optical power and convex to the object side;
a fourth lens element having a positive optical power and having a meniscus shape convex to the image side; and
a fifth lens element having a negative optical power and having a biconcave shape,
wherein
an image-side surface of the fifth lens element has, on a sectional plane including an optical axis, a point, other than an intersection with the optical axis, at which a tangent line is perpendicular to the optical axis,
conditional formulae (1) to (4) below are fulfilled:
0.8<ff1<1.30\u2003\u2003(1)
0.5<f4f1<0.90\u2003\u2003(2)
0.6<d4d3<2.0\u2003\u2003(3)
0.80<R3\u20141f<2.20\u2003\u2003(4)
where
f represents a focal length of the entire imaging lens system;
f1 represents a focal length of the first lens element;
f4 represents a focal length of the fourth lens element;
d3 represents an axial thickness of the second lens element;
d4 represents an axial aerial distance between the second and third lens elements; and
R3\u20141 represents a radius of curvature of the object-side surface of the third lens element on the optical axis; and
wherein an object-side surface of the third lens element has a positive curvature that increases from an intersection with the optical axis to a peripheral part.
20. An imaging optical device comprising:
an imaging lens system for imaging a subject image on an image sensing surface of an image sensing device, the imaging lens system comprising, from an object side:
an aperture stop;
a first lens element having a positive optical power and convex to the object side;
a second lens element having a negative optical power;
a third lens element having a positive optical power and convex to the object side;
a fourth lens element having a positive optical power and having a meniscus shape convex to the image side; and
a fifth lens element having a negative optical power and having a biconcave shape,
wherein
an image-side surface of the fifth lens element has, on a sectional plane including an optical axis, a point, other than an intersection with the optical axis, at which a tangent line is perpendicular to the optical axis,
conditional formulae (1) to (4) below are fulfilled:
0.8<ff1<1.30\u2003\u2003(1)
0.5<f4f1<0.90\u2003\u2003(2)
0.6<d4d3<2.0\u2003\u2003(3)
0.80<R3\u20141f<2.20\u2003\u2003(4)
where
f represents a focal length of the entire imaging lens system;
f1 represents a focal length of the first lens element;
f4 represents a focal length of the fourth lens element;
d3 represents an axial thickness of the second lens element;
d4 represents an axial aerial distance between the second and third lens elements; and
R3\u20141 represents a radius of curvature of the object-side surface of the third lens element on the optical axis; and
wherein an object-side surface of the third lens element has a positive curvature that increases from an intersection with the optical axis to a peripheral part; and
an image sensing device for converting an optical image formed on an image sensing surface into an electrical signal,
wherein the imaging lens system is arranged such that an optical image of a subject is formed on the image sensing surface of the image sensing device.