# US 10,500,859 B2 · Molded die slivers with exposed front and back surfaces

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- Number: US 10,500,859 B2
- Document ID: US10500859B2
- Status: Granted
- Kind: B2
- Application number: 16/110,346
- Filed: 2018-08-23
- Published: 2018-12-20
- Granted: 2019-12-10
- Earliest claimed: 2013-03-20
- Assignees: Hewlett-Packard Development Company, L.P.
- Applicants: Hewlett-Packard Development Company, L.P.
- Inventors: Chien-Hua Chen; Michael W. Cumbie
- Web page: https://patentgrep.com/patent/US10500859B2

## CPC

- B41J 2/1601: {Production of bubble jet print heads (B41J2/1606, B41J2/162 take precedence)}
- B41J 2/1607: {Production of print heads with piezoelectric elements (B41J2/1606, B41J2/162 take precedence)}
- B41J 2/1628: {dry etching}
- B41J 2/1632: {machining}
- B41J 2/1637: {molding}
- B41J 2/1645: {thin film formation by spincoating}
- B41J 2/04523: {reducing size of the apparatus}
- B41J 2/14145: {Structure of the manifold}
- B41J 2/1639: {sacrificial molding}
- B41J 2202/19: Assembling head units
- B41J 2202/20: Modules
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS

## Abstract

In some examples, a print cartridge comprises a printhead die that includes a die sliver molded into a molding. The die sliver includes a front surface exposed outside the molding to dispense fluid, and a back surface exposed outside the molding and flush with the molding to receive fluid. Edges of the die sliver contact the molding to form a joint between the die sliver and the molding.

## Claims

### Claim 1

A print cartridge comprising:
a housing to contain a printing fluid; and
a printhead die supported by the housing, the printhead die comprising a molding and a die sliver molded into the molding, the die sliver comprising:
a front surface exposed outside the molding to dispense fluid;
a back surface exposed outside the molding and flush with the molding to receive fluid; and
edges that contact the molding to form a joint between the die sliver and the molding.

### Claim 2 (depends on 1)

The print cartridge of claim 1, wherein the front surface of the die sliver is flush with the molding.

### Claim 3 (depends on 1)

The print cartridge of claim 1, wherein the printhead die comprises:
fluid feed holes formed in the die sliver to enable fluid flow through the die sliver from the back surface to the front surface.

### Claim 4 (depends on 3)

The print cartridge of claim 3, wherein the die sliver comprises:
a fluidics layer on the front surface; and
drop generators formed in the fluidics layer to receive fluid from the fluid feed holes and to eject fluid drops.

### Claim 5 (depends on 1)

The print cartridge of claim 1, wherein the edges comprise tapered edges and the joint comprises a molded lip that covers the tapered edges.

### Claim 6 (depends on 5)

The print cartridge of claim 5, wherein the die sliver comprises a silicon substrate and a fluidics layer, and wherein the tapered edges comprise tapered edges of the silicon substrate that taper outward such that the silicon substrate is wider than the fluidics layer.

### Claim 7 (depends on 1)

The print cartridge of claim 1, wherein the printhead die comprises:
a joint enhancement feature to increase surface area contact between the edges and the molding.

### Claim 8 (depends on 7)

The print cartridge of claim 7, wherein the joint enhancement feature comprises the edges that are tapered in a plurality of directions.

### Claim 9 (depends on 8)

The print cartridge of claim 8, wherein the edges comprise outward tapered edges and inward tapered edges.

### Claim 10 (depends on 7)

The print cartridge of claim 7, wherein the joint enhancement feature comprises the edges with notches formed in the edges.

### Claim 11 (depends on 7)

The print cartridge of claim 7, wherein the joint enhancement feature is selected from the group of features consisting of a groove, a cut, a notch, a channel, an indentation, a bump, and/or a combination thereof.

### Claim 12 (depends on 1)

The print cartridge of claim 1, wherein the printhead die comprises:
a plurality of die slivers molded into the molding; and
a manifold that includes a plurality of apertures, each aperture of the plurality of apertures associated with a different die sliver of the plurality of die slivers to deliver a particular fluid thereto.

### Claim 13 (depends on 12)

The print cartridge of claim 12, further comprising a die carrier to which the plurality of die slivers are adhered.

### Claim 14

A fluid dispensing device comprising:
a housing to contain a fluid; and
a molded printhead die supported by the housing, the molded printhead die comprising:
a molding and a die sliver embedded in the molding, the die sliver having edges forming a joint with the molding, and a front surface and back surface exposed outside of the molding, the back surface flush with the molding to receive fluid, and the front surface to dispense fluid, the fluid to flow from the back surface to the front surface through fluid feed holes in the die sliver.

### Claim 15 (depends on 14)

The fluid dispensing device of claim 14, wherein the front surface of the die sliver is flush with the molding.

### Claim 16 (depends on 14)

The fluid dispensing device of claim 14, wherein the molded printhead die comprises a plurality of die slivers arranged parallel to one another laterally across the molding along a bottom part of the housing.

### Claim 17 (depends on 14)

The fluid dispensing device of claim 14, further comprising:
a die carrier to which the molded printhead die is adhered; and
a manifold to route the fluid through the die carrier to the die sliver.

### Claim 18 (depends on 14)

The fluid dispensing device of claim 14, wherein the joint comprises:
a tapered edge of the die sliver; and
a molded lip of the molding adjacent to the tapered edge of the die sliver.