Camera module

• US 10,640,648 B2
• Filed: 11/17/2017
• Issued: 05/05/2020
• Est. Priority Date: 04/09/2014
• Status: Active Grant

• Current Assignee: Ticona LLC (Celanese Corporation)
• Original Assignee: Ticona LLC (Celanese Corporation)
• Inventors: Kim, Young Shin
• Primary Examiner(s): Reisner, Noam
• Application Number:
  US15/815,756
• Publication Number:
  US 20180086914A1
• Time in Patent Office: 900 Days
• CPC Class Codes: C08K 2003/3045 Sulfates
• CPC Class Codes: C08K 2003/325 Calcium, strontium or barium phosphate
• CPC Class Codes: C08K 2201/003 Additives being defined by their diameter
• CPC Class Codes: C08K 3/013 Fillers, pigments or reinforcing additives
• CPC Class Codes: C08K 3/32 Phosphorus-containing compounds
• CPC Class Codes: C08K 7/10 Silicon-containing compounds
• CPC Class Codes: C08K 7/14 Glass
• CPC Class Codes: C08L 67/03 the dicarboxylic acids and dihydroxy compounds having the carboxyl- and the hydroxy groups directly linked to aromatic rings
• CPC Class Codes: C08L 77/12 Polyester-amides
• CPC Class Codes: C09K 19/38 Polymers
• CPC Class Codes: C09K 19/3809 Polyesters; Polyester derivatives, e.g. polyamides
• CPC Class Codes: C09K 2019/521 Inorganic solid particles

Abstract

A camera module containing a molded part (e.g., generally planar base, lens barrel mounted on the base, etc.) that is formed form a polymer composition is provided. The polymer composition includes a liquid crystalline polymer and inorganic particles that have a hardness value of about 2.5 or more based on the Mohs hardness scale.

Claims

1. A camera module that comprises a molded part having a thickness of about 500 micrometers or less, wherein the molded part is formed from a polymer composition that comprises a thermotropic liquid crystalline polymer, a conductive filler, and from 10 wt. % to about 50 wt. % of inorganic particles having a hardness value of from 2.5 to 4.5 based on the Mohs hardness scale, wherein the inorganic particles have a median width of from about 2 to about 20 micrometers, wherein the inorganic particles contain barium sulfate;

wherein the conductive filler includes an ionic liquid.

2. The camera module of claim 1, wherein the camera module comprises a generally planar base on which is mounted a lens barrel, wherein the base, barrel, or both contain the molded part.

3. The camera module of claim 1, wherein the inorganic particles have a hardness value of from about 3.0 to about 3.5 based on the Mohs hardness scale.

4. The camera module of claim 1, wherein liquid crystalline polymers constitute from about 25 wt. % to about 95 wt. % of the composition.

5. The camera module of claim 1, wherein the liquid crystalline polymer contains aromatic ester repeating units.

6. The camera module of claim 5, wherein the aromatic ester repeating units are aromatic dicarboxylic acid repeating units, aromatic hydroxycarboxylic acid repeating units, or a combination thereof.

7. The camera module of claim 5, wherein the polymer further contains aromatic diol repeating units.

8. The camera module of claim 1, wherein the liquid crystalline polymer contains repeating units derived from 4-hydroxybenzoic acid, terephthalic acid, hydroquinone, 4,4′

-biphenol, acetaminophen, 6-hydroxy-2-naphthoic acid, 2,6-naphthelene dicarboxylic acid, or a combination thereof.

9. The camera module of claim 1, wherein the polymer composition further comprises mineral fibers.

10. The camera module of claim 9, wherein the mineral fibers include fibers derived from a silicate.

11. The camera module of claim 10, wherein the silicate is an inosilicate.

12. The camera module of claim 11, wherein the inosilicate includes wollastonite.

13. The camera module of claim 1, further comprising a glass filler, silicate filler, functional compound, or a combination thereof.

14. The camera module of claim 1, wherein the molded part has a Rockwell hardness of about 40 more, as determined in accordance with ASTM D785-08 (Scale M).

15. The camera module of claim 1, wherein the inorganic particles constitute from about 20 wt. % to about 50 wt. % of the polymer composition.

16. The camera module of claim 1, wherein the inorganic particles have a mean width of from about 3 to about 15 micrometers.

17. The camera module of claim 1, wherein the inorganic particles containing barium sulfate have a narrow size distribution such that at least about 60% by volume of the particles containing barium sulfate have a median width of from 2 to 20 micrometers.

18. The camera module of claim 1, wherein liquid crystalline polymers constitute from about 25 wt. % to about 95 wt. % of the composition.

19. The camera module of claim 1, wherein liquid crystalline polymers constitute from about 40 wt. % to about 70 wt. % of the composition.

20. The camera module of claim 1, wherein the molded part exhibits a surface resistivity of about 1×

10¹⁵ ohms or less.

21. The camera module of claim 1, wherein the molded part exhibits a volume resistivity of about 1×

10¹⁵ ohm-m or less.

22. The camera module of claim 1, wherein the molded part exhibits a Rockwell hardness of about 40 or more as determined in accordance with ASTM D785-08 (Scale M), surface resistivity of about 1×

10¹⁵ ohms or less, and volume resistivity of about 1×

10¹⁵ ohm-m or less.