Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Imaging optical system, projection display device, and imaging apparatus

A technology of imaging optics and optical axis, which is applied in the fields of imaging optical systems, projection display devices and camera devices, can solve the problems of miniaturization, enlargement, large lens diameter, etc., and achieve the effect of wide viewing angle

Active Publication Date: 2020-03-31
FUJIFILM CORP
View PDF8 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the imaging optical system of Patent Document 1, if the angle of view is to be expanded, the total length of the lens and the diameter of the lens will increase. There is a problem that it is difficult to miniaturize
In addition, since the lens diameter of the relay lens part having the moving lens group that moves when changing magnification is large, there is a problem of increasing the size if a mechanism for moving the moving lens group is included.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Imaging optical system, projection display device, and imaging apparatus
  • Imaging optical system, projection display device, and imaging apparatus
  • Imaging optical system, projection display device, and imaging apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] A cross-sectional view showing the structure of the imaging optical system of Example 1 is shown in figure 1 , a cross-sectional view showing a modified example of the imaging optical system of Example 1 is shown in figure 2 . figure 1 The graphical method of is as described above, and for figure 2 also with figure 1 The same illustration method, so some repeated descriptions are omitted here. In addition, the illustration method is basically the same as that of Examples 2 to 4.

[0090] figure 1 The imaging optical system of the illustrated embodiment 1 includes the first lens group G1 and the second lens group G2 in sequence along the optical axis Z from the magnification side to the reduction side, and the first lens group G1 and the second lens group G2 on the optical axis Z are A relay-type imaging optical system that forms an intermediate image M between the 2 lens groups G2.

[0091] The first lens group G1 is composed of 14 lenses of lenses L1a to L1n, a...

Embodiment 2

[0122] Next, the imaging optical system of Example 2 will be described. A cross-sectional view showing the structure of the imaging optical system of Example 2 is shown in image 3 , a cross-sectional view showing a modified example of the imaging optical system of Example 2 is shown in Figure 4 . The configuration of the imaging optical system of Example 2 is the same as that of the imaging optical system of Example 1. In addition, the basic lens data of the imaging optical system of Example 2 are shown in Table 5, the data related to the specifications are shown in Table 6, and the data related to the variable surface distance are shown in Table 7, and the data related to the aspheric coefficient The data of is shown in Table 8, and each aberration diagram is shown in Figure 10 .

[0123] [table 5]

[0124] Embodiment 2 Lens data (n, ν are d lines)

[0125] face number radius of curvature face spacing n ν *1 -5.9079 1.0788 1.53158 55.08 *...

Embodiment 3

[0136] Next, the imaging optical system of Example 3 will be described. A cross-sectional view showing the structure of the imaging optical system of Example 3 is shown in Figure 5 , a cross-sectional view showing a modified example of the imaging optical system of Example 3 is shown in Image 6 . In the second lens group G2, the first moving lens group is composed of two lenses L2a to L2b, and the second moving lens group is composed of six lenses L2c to L2h. In addition, the imaging of Embodiment 3 The structure of the optical system is the same as that of the imaging optical system of Embodiment 1. In addition, the basic lens data of the imaging optical system of Example 3 are shown in Table 9, the data related to the specifications are shown in Table 10, the data related to the variable surface distance are shown in Table 11, and the data related to the aspheric surface coefficient are shown in Table 11. The data of is shown in Table 12, and each aberration diagram is ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides an imaging optical system which is small in size, has a wide viewing angle, has properly corrected aberrations, and has high optical performance, a projection display device provided with the imaging optical system, and an imaging device provided with the imaging optical system. The imaging optical system includes, in order from an amplification side along an optical axis, afirst lens group and a second lens group. An imaging optical system in which an intermediate image is formed between a first lens group and a second lens group on an optical axis, at least one of thefirst lens group and the second lens group is provided with a reflection member that bends the optical axis, the second lens group is provided with a moving lens group that moves during zooming, andthe imaging optical system satisfies a prescribed conditional expression.

Description

technical field [0001] The present disclosure relates to an imaging optical system, a projection display device, and an imaging device. Background technique [0002] Conventionally, a projection display device using a light valve such as a liquid crystal display element or a DMD (Digital Micromirror Device, registered trademark) display element has been widely used. [0003] In such a projection display device, it is required to increase the degree of freedom in setting the distance to the screen and to further improve the installation property in an indoor space. Therefore, there is an increasing demand to mount a versatile imaging optical system with a zoom function, a compact structure, higher performance, and a wider angle in a projection display device. [0004] In order to meet such demands, an imaging optical system has been proposed which is a relay-type imaging optical system that forms an intermediate image, and includes a moving lens group that moves when the mag...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H04N9/31G02B17/08
CPCH04N9/3141H04N9/317G02B17/08G02B13/16G02B27/149G02B15/1425G03B21/142G02B15/20G02B15/142
Inventor 永利由纪子
Owner FUJIFILM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com